Conan, Sonoko et Ran veulent aller manger à un buffet de pâtisseries pour célébrer la victoire de cette dernière à un tournoi régional de karaté. Dans les transports en commun, ils font la connaissance d'une redoutable personne, experte en arts martiaux et en déduction. Ce nouveau détective lycéen se présente sous le nom de Sera. Une fois à l'hôtel où a lieu le buffet, une affaire éclate, que Conan va se dépêcher de résoudre, en faisant attention à ce fameux Sera, qui semble représenter un danger à plus d'un égard…

After investigating the room, Masumi declares the culprit to be Toshiko Hirukawa as she lied about the elevator usage to Conan. She reveals Hirukawa got Usumi drunk, placed him on the wheelchair, and used a system of strings connected to the elevator to throw him out the window. However, re-acting the scene fails, until Conan voices his deductions over the phone as Shinichi revealing the paint cans were placed out of the window to tilt the wheelchair. Hirikawa confesses and reveals her father begged Usumi to apologize for scamming her mother but was refused. Afterwards, her father committed suicide after her mother died from shock. In the aftermath, Usumi's hidden bank account was found and the transactions to it allowed the police to apprehend the scam group. Masumi later enrolls into Ran and Sonoko's classroom.

Kazuha et Heiji vont à Tokyo pour travailler sur une enquête. De passage à l'agence Môri, ce dernier fait la rencontre de la nouvelle élève, Sera Masumi. Sous les questions de la jeune fille, la rivalité intellectuelle entre les détectives de l'Est et l'Ouest s'attise. Une affaire éclate, liée - une fois de plus - à la présence malencontreuse de l'agent spécial André Camel. Les jeunes gens décident de faire de cette enquête le théâtre de leur affrontement, sous l'œil scrutateur de Sera.

Le lycée Teitan accueille une nouvelle élève, une détective lycéenne du nom de Sera Masumi. De par ses activités, elle se lie avec Ran et visite l'agence Môri, en prétextant vouloir parler d'enquêtes. Elle semble évoquer un intérêt tout particulier pour Conan, qui est chez le professeur Agasa. Alors qu'elle s'apprête à partir, un client pas comme les autres apparaît, et menace de faire exploser l'agence si l'on ne résout pas l'affaire du meurtre de sa sœur. Grâce à la rapidité de réaction de Sera, Conan va pouvoir tout entendre par téléphone, et les aider de son mieux par téléphone.

Sawaguri, pleased to have another detective to assist in the case, obeys his requests to take pictures of the hostages' books which were autographed by Miku. During the course of the investigation, the authorities lose the chance to snipe Sawaguri after Ran closes the curtain as she believes Shinichi can find a solution to prevent any deaths. Miku's blog post reveals her last three visitors were from an elephant, a fox, and a rat. Conan explains the animals were based on the hostages' professions: The elephant is Sumika Nihei, due to her husband's seal designs which are similar to an elephant's tusk; Shinobu Yuchi is the fox since she is a baker and her food is colored like a fox's coat; and the rat is Tamami Mitsui whom is a stonemasonry which is gray like a rat's coat. In response, Sawaguri prepares to kill Mitsui.

Conan declares Mitsui is innocent since she was witnessed leaving Miku's room; Sawaguri inferred the culprit crossed over from the balcony and left by his room. As for Miku's death, Conan explains she was mimicking the suicide of the main character in her book. Sawaguri becomes distraught as a result and is taken in by the authorities. Later, Conan reveals his previous deduction was a bluff and that Miku was murdered by Yuchi, due to the fact Mitsui left the room with Yuchi's slippers revealing Yuchi was still in Miku's room after she left. As evidence, Yuchi's book reveals it had been sandpapered to clean off Miku's blood. Yuchi confesses and reveals Miku took all the credit on the book they collaborated on motivating her for revenge.

Un célèbre chocolatier demande des fonds au groupe Suzuki, appartenant à la famille de Sonoko. Cette dernière est envoyée en témoin-test avec Ran et Conan en prévision d’une future cérémonie. Mais au cours de la répétition, la pièce en chocolat prend feu et immole le chocolatier multi-récompensé.

Heiji emmène Kazuha et les membres de l'Agence Môri l'accompagner pour enquêter sur l'affaire qui l'amène à Tokyo. Un homme est mort dans sa maison à Osaka, et "dying message" a disparu sans laisser de traces. La famille de cet homme habitant dans la capitale, ils décident de lui rendre visite afin d'élucider ce mystère, mais une série de crimes dans la maison va changer le plan des détectives. De plus, Ran a des révélations à faire à Kazuha

The police arrive and their investigations reveal the baumkuchen was cut evenly into eight pieces and that only one of the piece was poisoned. As police interviews the suspects while the widow, Serika Wakamatsu, is excluded since she was never close to the baumkuchen tray. Meanwhile, the police detectives in Nagano reveal to Heiji that Wakamatsu's killer reorganized the bathroom tiles to hide the dying message; The tiles used the crazy diamonds optical illusion giving the impression that it could not be rearranged without breaking the pattern. When arranged back to normal, the message reads "SON" indicating Ikuro was Wakamatsu's killer.

Conan and Heiji resume their investigation while Ran and Kazuha gossip about Shinichi's confession towards Ran. Conan and Heiji discover powdered poison on Ikuro's doorknob and Serika's slippers; the evidence indicates her as Ikuro's murderer. The two confront Serika whom is found dead in her office from cyanide poisoning. Wakamatsu's secretary, Satake Yoshimi, reveals that per Serika's will, a letter of confession to Wakamatsu's murder is to be given to the police upon her death; the letter confirms Ikuro was the murderer and Serika's role in hiding the dying message.

Conan and Heiji's investigation leads them to realize how Ikuro and Serika were murdered. They reveal that when two pieces of the baumkuchen were left, they were rearranged using the Jastrow illusion and applied poison to the seemingly larger piece. For Serika's murder, the same culprit used the Gestaltzerfall phenomenon while she was signing contracts. This caused her to forget how to write the Waka (若) kanji forcing her to open a dictionary to the Wa (わ) pages where poison was applied. They reveal the culprit to be Satake, evidenced by the shine on her bronze watch due to a chemical reaction with cyanide. Satake confesses to the murders and explains it was to avenge Wakamatsu who was secretly her father. In the aftermath, Kazuha attempts to confess her feelings to Heiji but fails when he leaves partway.

Le professeur Agasa cherche à vendre un vieux vase qu'il a trouvé dans sa remise. Pour ce faire, il poste une vidéo sur internet, dans laquelle apparaît malencontreusement Ai. Peu après, Ayumi est enlevée, roulée dans un tapis, alors qu'elle portait des vêtements empruntés à Ai. De plus, l'énigmatique Sera rôde…

Conan realizes the kidnappers invaded Agasa's home too quickly and deduces they have visited recently; Agasa reveals three pairs of customers have expressed interest in the vase. Realizing the culprits watched Agasa's online video of the vase, Conan finds the picture of the missing cat online and realizes the cat was a red hering. Conan realizes the culprits exchanged Agasa's rug with a fake and that the real rug is a valuable Persian rug. He deduces the culprits are knowledgeable about rugs and run a nearby carpet store since they had to disguise their voices. After finding an image of the culprit online, the Detective Boys confront the kidnappers, and have them convicted them based on Ayumi's earprint found on the real rug. Conan has Agasa's video erased, due to Haibara's appearance on it. Elsewhere, Masumi assists in deleting the same videos.

Les détective juniors découvrent la voiture de l'agent Chiba vandalisée. C'est la dernière occurrence dans une affaire de vandalisme en série. Les enfants décident d'aider les forces de police, et de faire travailler ensemble l'agent Chiba et l'agent de circulation Miike Naeko (cf épisode 624), qui ont un passé commun.

Chiba is unable to recall Naeko's face though notes his familiarity. During the investigation, Conan realizes the culprit's motif and has the police let the suspects leave. During the night, the police set up an itasha to lure the culprit out, revealing the culprit to be Tokuko Shigei. Tokuko was vandalising cars with obstructions on their rear windows due to the trauma of her child being killed by a car of the same condition. Afterwards, Chiba remembers passing by Naeko but remains unsure of her identity.

Kogorō prévoit de passer une nuit à boire en abandonnant Ran et Conan. Alors que Ran s'énerve contre son bon-à-rien de père, une vieille dame la sermonne, en lui déclarant que Kogorō Môri est quelqu'un de charmant, qui l'aide à domicile depuis plusieurs semaines. Intrigués, Ran et Conan vont voir sur place, et font face à une grosse surprise. Leur étonnement initial va cependant s'avérer être plus innocent qu'ils ne le pensaient.

Conan completes his investigation and realizes who the murderer is. The suspects, realizing Ryohei is a fake, challenges him to declare who the culprit is. Conan relays his deductions to Ryohei explaining a system of fans and TV remotes created a fake time of death; This was done setting one of the fans and remote to channel surf while the other fan and remote is set on a timer to turn off the TV. They reveal the remotes were most likely held in place by a rubber band which Hyodo Junjei has on him. As evidence, the blood smear from the victim was found on the rubber bands. Junjei confesses and reveals the victim blackmailed him after finding out he was a drug dealer. Conan and Ran confront Ryohei about his identity and learns Kiritani was his elementary school teacher who influenced him. Days later, Kiritani sends a post card to Kogoro thanking him for sending his disciple Ryohei, to look after her.

The Detective Boys wish to capture a few beetles to bring to school, and as a result, visit Agasa's old friend in the mountains. The Detective Boys manage to find a bunch of beetles at night, but return to find Namatame injured. Namatame's last words are "Miyama Stag Beetle" before losing consciousness.

The Detective Boys find a strange map on the back of a piece of paper, with many 'x's at different locations. As the group visits each house, they are able to figure about the meaning behind the 'x's, as well as the identity of the murderer.

Anblick Tateno and Kogoro found a dead body in the house and a devious old man was murdered in cold blood, leaving only the letter "k" as a message. And there were two suspect who might be true culprit of the murder in cold blood, and both of them had a "K" letter in each name.

Officer Chiba is asked to help a woman who feels she is being stalked, but after the supposed stalker is found dead in her home. It is suspected she murdered him, and Conan have to uncover the truth behind the crime scene.

Kogorō est, avec Ran et Conan, à la célébration de fiançailles de vieux amis à lui. Dans la soirée, une tragédie éclate, cachant un drame encore plus profond. Pour aider à l'enquête apparaît un nouveau personnage mystérieux, le détective privé Amuro Toru.

A second DNA test with sterile samples reconfirms the rough DNA match leading Conan to a conclusion. Conan tranquilizes Kogoro and reveals Banba and Kamon are opposite sex identical twins. The secret phone calls were to a medical consultant with the final phone call confirming the genetic match. Learning of his, Kamon clasped her face into her hands, scratching some skin off, and committed suicide. In the aftermath, Amuro pays Kogoro to have him as his apprentice.

Ran's karate senpai, Kyodo Nanami, invites the Detective Boys for a treasure hunt at her home. Once there, they discover the fact that the treasure is very likely hidden in the Dark Tower. However, there aren't any entrances nor windows to enter the tower with. Around the estate, they also discover that this house has been equipped with various tricks and traps. Later, Nanami's mother, Kyodo Momoe, had been discovered dead, thought to have fallen from the tower. While investigating both cases, Haibara disappears, and the others also discover two secret entrances.

While investigating in a tunnel, Conan is separated from everybody else. As he realizes he has ventured into the tower itself, he lets everybody into the tower. He then tranquilizes Kogoro and explains that Momoe's death was an accident due holography and a misunderstanding. Afterwards, Haibara, Ayumi, Mitsuhiko, and Genta are discovered to be safe and that the treasure hidden in the tower was a giant kaleidoscope.

Mouri, Ran, and Conan try surfing for the first time with their surf instructor and her much older husband. The couple soon gets into a heated argument over the safety of surfing with an approaching storm, hinting at a troubled relationship. They find the wife dead on the beach the next morning. The absence of footprints suggest a surfing accident. Conan soon observes clues indicating foul play. Sleeping Kogoro reveals that the husband murdered his wife and carried her body to the beach without leaving footprints by crawling inside a cardboard wheel.

Sonoko, Ran, and Conan are visiting a cacti greenhouse. The sons of the owner interrupt with angry outbursts about being removed from their father's will. The owner explains that he's disappointed in his sons living off his fortune and that he will leave everything to the botanical garden. The security alarm later rings and the son Yasuyuki is found standing over his father's dead body. All clues point to him as the culprit, but the Queen of Deduction reveals that Misa, the housekeeper, killed the owner and used the greenhouse temperature settings to trigger the security alarm to create a time alibi.

Depuis l'affaire précédente, un jeune détective du nom d'Amuro Toru a pris un travail au café Poirot, afin de suivre les enseignements de Kogorō. Le célèbre détective endormi vient de mettre en place son site internet, et attend un client. Grâce aux déductions d'Amuro, ils comprennent que quelqu'un est enfermé dans les toilettes de l'agence, mais ils entendent un coup de feu et découvrent un cadavre, accompagné d'une jeune femme apparemment tenue contre son gré. Conan a cependant des doutes sur la véracité de son histoire.

Les membres de l'agence Môri vont visiter l'appartement de la femme louche. Cette dernière agit de plus en plus étrangement, et enlève Conan quand les autres ont le dos tourné. Pendant cela, la détective lycéenne Sera Masumi s'inquiète beaucoup de Ran et Conan, car elle a appris aux informations qu'on avait découvert un cadavre à l'agence. Ran dit à tout le monde que Conan a disparu, y compris au professeur et à Ai, pour que tous puissent se lancer à sa recherche.

Trois groupes sont à la recherche de Conan, enlevé par une criminelle: Kogorō, Ran et Amuro d'un côté, la détective Sera Masumi de l'autre, ainsi que Haibara Ai, le professeur Agasa et Subaru dans une autre voiture. Le jeune détective est cependant plus conscient de sa situation qu'il n'en laisse paraître et, contre toute, attente, va enquêter avec sa ravisseuse.

Conan résout l'enquête de sa ravisseuse, mais échoue à désamorcer la situation, et se retrouve enlevé par une criminelle plus dangereuse encore. De plus, il semblerait que le membre de l'organisation des hommes en noir nommé Bourbon se cache parmi des visages familiers.

Le professeur et les détective juniors ont été invités à un barbecue par un couple qu'ils ont rencontré dans un camping. Sera, qui a appelé Conan pour discuter de l'affaire précédente, semble particulièrement curieuse quant à la présence d'Ai. Arrivés chez le couple, le barbecue est vite teinté des disputes entre leurs hôtes. Malheureusement, un drame terrible est sur le point de se produire, que les déductions de Conan vont rendre encore plus tragique.

The wife is taken to the hospital. After seeing the situation and finding proofs, Conan deduces that the husband tried to kill his wife.

The operation turned out to be successful. The husband afraid of, that his wife would reveal everything, tried to commit suicide but was stopped by Conan and Haibara. He confesses that he tried to his wife. After the confession Conan tells him about the true messages that his wife sent to his colleagues and also tells that his wife is pregnant although she is not aware of it. Meanwhile after recovery the wife changes her statement to prevent her husband from going to jail.

Ran wins a trip to Nagasaki with Mouri and Conan. While touring the city, they unintentionally interrupt the filming of a mystery drama. Mouri is hired as a consultant to figure out the story's ending because the scriptwriter disappeared. The group examines the scriptwriter's room and finds newspaper clippings of a real case of serial thefts. The group spots the scriptwriter but he runs off before they can catch up to him. When the next part of the script is e-mailed to the crew, Ran and Conan are dragged in as extras. Conan realizes that the script contains hidden messages. The prop technician is attacked and he points at Ran with his dying breath.

Conan luckily finds a witness who saw Ran studying her lines providing her with a solid alibi. One of the actors, Sazanami, is attacked later that night and the scriptwriter's fingerprints are found on his belongings. Conan follows the clues in the hidden messages and gathers everyone at the theater. Sleeping Kogoro reveals that the scriptwriter discovered that Sazanami and the prop technician were partners in the serial thefts and feared for his life. The prop technician understood the hidden messages and tried to run away. He pointed at Ran because the role she was playing held the clues to identifying Sazanami.