Quando Lala viene a sapere che a tutti gli uomini piacciono le tette decide di costruire un'invenzione per far crescere di diverse misure anche le sue così da far colpo su Rito. Tutto ad un tratto però Rito viene lanciato fuori dalla finestra dell'aula e cade proprio sull'invenzione di Lala trasformandolo in una donna, Riko Yusaki.

Rito ormai trascorre quasi tutto il proprio tempo con Lala e non parla quasi mai con sua sorella Mikan che si sente sola e trascurata. L'ennesimo disastro combinato da Lala e Rito fa arrabbiare la ragazza che se ne va di casa.

Haruna vince ad un concorso a premi un viaggio per dieci ragazze in un villaggio turistico del sud. Risa così decide di autoinvitarsi assieme a Mio e portare con loro anche le altre ragazze della serie. Essendo un viaggio per sole ragazze, Rito non può partire con loro, ma un'invenzione di Lala lo trasforma accidentalmente in una borsa, ritrovandosi in seguito in viaggio con le altre.

Rito, Haruna, Mikan e Yui si ritrovano all'interno di un videogioco RPG gestito da due misteriose ragazze incappucciate.

Le sorelline di Lala, Nana e Momo, causano diversi problemi a Rito e ai suoi amici durante la festa dei ciliegi in fiore.

Momo tries to get Rito’s attention by changing her hair style, but has little success. Momo then learns from Lala that Rito loves both Lala and Haruna, and since he will become king of Deviluke he can marry both girls, and return both of their love. Inspired, Momo begins a plan to eliminate Rito’s indecisive nature and create him a harem, that way Momo and the other girls who love Rito can have their love for him be fulfilled. A drunken Celine sprays Mikan with pollen, causing Mikan to develop romantic feelings towards Rito. As she waits for the effects to wear off, Momo learns of her plight and “helps” by leaving her alone with Rito. Mikan succumbs to the effect of the pollen and nearly kisses him, but manages to regain her senses at the last minute. Momo decides Mikan is not yet ready to accept her own feelings, but promises she will include Mikan in the harem. Thanks to one of Lala’s inventions, Haruna is turned into a cat and wanders the streets contemplating what to do. Remembering that Nana can speak to animals, she goes to find her, but runs into Rito. Circumstances then force Rito to give Haruna a bath, which becomes too much stimulation for her causing her to revert back to normal, albeit naked and on top of an unconscious Rito. An embarrassed Haruna is then left to explain the situation to a confused Mikan.

Kotegawa Yui is going to look at cats on the petstore as usual when she finds Rito on the way, they encounter the skunk of youth who broke free from Run's house. Rito tries to grab it but scares it and him and Yui end up turning young again. Eventually all of Rito's friends are turned into kids. Rito eventually was able to catch the skunk from a high wall where he almost fell but was saved by Yami. The skunk was then put into Nana's Phone where it won't disturb anymore. Back in school Yui asks Rito if he used to play around a temple she walked by and he confirmed, she then remembered he was the kid who saved a kitten that was stuck in a tree when she was young. Nana enters Rito's room wanting to talk to him, she asks him if he likes big breast girls. He blushes and starts imagening big breasts, Nana seems upset but Rito replies to her saying it's not the breast size that matters and Nana even not having big breasts has her own unique appeal. Nana removes her shirt and gets on top of Rito asking him if he sees her as a woman. Rito desperately tries to get away but grabs her breast, she doesn't slap him and leans to kiss him. Momo burts out of the closet to stop them. Momo and Nana had switched minds with one of Lala's inventions and Momo was the one in Nana's body. They walk away with Nana (now in her body) blushing and thinking about what she heard Rito say. Rito finds Celine playing with some flowers he's never seen. He smells a pot that has purple flowers and then walks away. Momo finds Celine and explained how those were her flowers and no one should smell them because they can have side effects, Celine told Momo Rito had smelled the purple flowers and she was really worried since those flowers change one's personality. Rito demands Lala to give him her see through glasses and asks her to pose for him. Excited, Rito starts asking for more breasts and runs to school where he looks at each and every girl and even looks closely at Yui's privates. Momo finds Rito and heals him before anything worse happened. Rito Falls unconsious on the floor from all the things he saw.

The episode starts with all of Lala's inventions scattered across a table. Lala is called to help Tearju Lunatique with the copier. Rito and Haruna accidentally change bodies when they catch one of Lala's inventions falling off the table. Momo explains that they have to use each other's bodies for seven hours. After school, Rito in Haruna's body gets splattered with mayonnaise when Haruna in Rito's body steps on a bottle of mayonnaise. The real Haruna has to then give her body a shower. However, the timer countdown finishes during this time, leaving Rito touching Haruna. Celine finds one of Lala's inventions, but because it seems to be broken, Momo lets her play with it. However, it fires a dart that lets Celine massage Tearju Lunatique, causing problems for her as it makes her feel as if someone is playing with her body. When Rito sees Tearju limping, he thinks she might be ill, so offers to take her to the sickroom. Celine uses the machine to violently caress her on the way, making her fall on top of Rito. Yami sees them and thinks that Rito is being "ecchi" to Tearju, so tries to kill him. The device is later revealed to be an invention to massage yourself. Lala gives it to Honekawa because he has terrible back pain.

PART A: Run co-stars in the new Magical kyoko-Kun episodeKyouko with her friend Kyouko. PART B: Kyouko makes a speech in Rito‘s school. After Rito rescued her from the crowd, she start to have a crush on Rito. PART C: Yami is attacked by a mysterious creature, and has nothing to do with it.

PART A: Mikan‘s friends make a surprise viste to Rito‘s house. PART B: Lala's invention, a mobile phone, makes a lot trouble for Yui. PART C: Celine grows up becuse of the shine Moonlight.

PART A: Run wants Rito to take pictures of her with a special camera she ordered on the Galactic Catalogue, guaranteed to make anyone an expert photographer.

PART B: Momo coincidentally meets up with Risa Momioka, but when she agrees to a shopping date she gets more than she bargained for.

PART C: Haruna offers to teach Rito how to make omelette rice, but the temperature quickly rises to unsustainable levels.

PART A: Momo, Nemesis and Rito exchange scary stories before bed time, but Rito ends up being the only one terrorized and out of breath.

PART B: Rito and friends help out at the health clinic for aliens, but get in a spot of trouble when some old technology is accidentally activated by Tearju. Yami bears witness to a most unfortunate sight.

The Queen of Deviluke, Sephie Michaela Deviluke, pays a surprise visit to Rito's home on Earth, which seems to put Momo on the spot. It turns out she is worried about her mother's unfortunate charm ability of causing intense bestial-like attraction in any male who sees her face.

Later, all the women share a bath in a hot-spring inside the virtual safari when Rito wanders in chasing after Celine. He runs as far as the changing area where he sees Sephie's face, however he is surprisingly unaffected. This is not the case for the rest of the animals...

Lala surprise-invites Rito to Haruna's apartment, but a device that she was working on turns a small mishap into a titanic situation.

The next day at school, Rito and Haruna are both encouraged by their peers to resolve the problem. However the location they thought isolated is soon wrapped up in yet another disaster!

It was a normal day until Lala's mecha-cat got away... Rito then became his and every girl's exponentially worst problem.

Momo introduces the members of Rito's harem while recapping ecchi scenes. Included in the Blu-ray/DVD Vol.01.