دينجي هو مراهق يعيش حياته كصياد الشيطان.

بهدف سداد الدين الذي ورثه عن والده، يبدأ في صيد الشياطين من أجل الياكوزا مع صديقه بوتشيتا، "شيطان المنشار"، بينما يعيش حياة فقيرة بشكل مأساوي.

فقط عندما تبدو الأمور وكأنها لا يمكن أن تزداد سوءا، يتعرض دينجي للخيانة والقتل من قبل الياكوزا. عندما يبدأ دينجي في الوعي، يسمع شخصا يتصل من داخل رأسه...

بعد احتجازه من قبل ماكيما، أحد صائدي شيطان السلامة العامة، يجد دينجي نفسه في حبها بفضل تلميحاتها الإيحائية.

يرغب دينجي في التعاون مع ماكيما، ويصل إلى مقر صائدي الشيطان في طوكيو، ويتعرف على أكي هاياكاوا، وهو صياد كبير كان من المفترض أن يتشارك معه. ولكن بعد ذلك يضرب هاياكاوا دينجي، ويطالبه "بالترك هذه الوظيفة"...

يقرر دينجي أن حلمه الجديد هو "مداعبة بعض الثدي".

يعرض شريكه، Power the Blood Fiend، السماح له بالشعور بثدييها فقط إذا أنقذ قطتها الأليفة القديمة Meowy من شيطان.

مع حلمه في الأفق، دينجي متحمس ومستعد للذهاب، حتى...

بعد معركة شرسة، يهزم دينجي "شيطان الوطواط" وينقذ القوة حتى بعد أن حاصرته.

يقول إن كل شيء من أجل "لمس ثدي القوة".

تسخر باور من دافعه السخيف قائلة "هذا سبب غبي جدا"، لكنها لا تزال توافق على السماح له بمداعبة ثدييها.

بينما يشعر دينجي بسعادة غامرة بالفكرة، فإنه يواجه هجوما مفاجئا من العدم...

Aki Hayakawa, Denji, and Power start living together.

Denji finally fulfills his dream of touching Power’s boobs, but is shocked when things do not turn out the way he expected. As Denji realizes that chasing his dream was more fun than achieving it, Makima approaches him and says, "If you can kill the Gun Devil, I’ll grant you one wish.”

Denji and Tokyo Special Division 4 members enter a hotel to collect a piece of the Gun Devil. However, they end up being trapped on the 8th floor due to the devil’s extraordinary power.

With the members being cornered on the endless 8th floor with seemingly no way to escape, the devil makes them an offer: “If you let me eat Denji, I will let all of the other devil hunters leave in one piece.”

Aki gets stabbed by Kobeni while protecting Denji. Seeing this, Denji jumps inside the “Eternity Devil” and starts attacking it. He fails to kill the “Eternity Devil” and his chainsaw power ends up fading after losing too much blood. But then, he manages to restore his power after eating the devil’s flesh and drinking its blood, and begins to fight back.

As Himeno watches Denji, she remembers the saying, “The Devil Hunters that devils fear are the ones with a few screws loose...”

Denji experiences his first, yet devastating, kiss.

An intoxicated Denji is taken to Himeno's house, where she starts seducing him. Feeling torn between Makima, whom he admires, and Himeno, who is standing in front of him, he decides to fall into temptation. However, Denji then finds something in his pocket: The Chupa Chups lollipop that Makima gave him.

A fierce battle unfolds between Denji and the menacing Samurai Sword. But even after Denji takes one of Samurai Sword's companions hostage, Samurai Sword slashes through them both until Denji is captured. Meanwhile, after seemingly being killed, Makima turns out to be alive. She sets out to rescue Denji with the help of Public Safety Devil Hunters from Kyoto, Kurose and Tendo.

Samurai Sword's vicious attack resulted in many lost personnel for Public Safety Devil Extermination Division 4.

Aki Hayakawa wakes up in a hospital bed, unable to accept the reality of losing Himeno. Kurose and Tendo then appear in front of Hayakawa, letting him know that they are now in charge of coaching him.

Meanwhile, Makima introduces Denji and Power to a member of Public Safety who will act as their mentor in order to strengthen Division 4.

Denji and Power complete their training with Kishibe, while Aki Hayakawa makes a new contract with the "Future Devil" through Kurose and Tendo.

Meanwhile, Makima threatens the yakuza boss into revealing the names of all those who have made contracts with the "Gun Devil," along with the location of Samurai Sword's hideout.

The time has finally come for Public Safety to begin their counterattack against Samurai Sword and his companions.

Sawatari sends the "Ghost Devil" after Hayakawa, and he's nearly killed before the "Ghost Devil" stops and hands him a cigarette with a message from Himeno. The words inside give Hayakawa the strength to kill the “Ghost Devil” and capture Sawatari.

Meanwhile, Denji heads into his rematch with Samurai Sword. With a pull of the starter on his chest, he transforms into Chainsaw Man.

And now, the last battle between Chainsaw Man and Samurai Sword has finally begun...