Episode list

Keita Suminoe has a problem with his twin step-sisters, Ako and Riko, being overly romantic towards him while his parents are away. He is uncertain what to do when his parents cannot attend a parent-teacher session. When Ako and Riko find the notice letter while snooping in his room, they go over to his school, only to be chased by several of their admirers. Keita stops everyone and tells his sisters off for causing a ruckus, but when he realizes why they came, he catches up with them and apologizes, revealing he turned down a recommendation to another school, and that he intends to study to get into their high school.

Ako decides to help Keita study in order to improve his chance of passing, though both have a little trouble staying focused on the matter at hand. Ako shows Keita her chest in order to encourage him to study, but this backfires when her chest ends up being all Keita can think about in class. Ako decides to try an alternative study method and starts writing the notes on her body. Despite embarrassing himself in school, he fares better on the tests. However, when Keita likens a kiss from Ako to a penalty game, Ako gets mad and corners him, eventually tricking him into a wrong answer so he has to take the penalty kiss.

Keita gets annoyed with being kissed by Ako and Riko all the time and instigates a total ban on kissing. Overhearing that Keita likes sweet things, Riko tries to make him some chocolate, but can only manage something horrific. After finding one of her father's dirty DVDs, she gives Keita some chocolate lipstick, persuading him to kiss it off her lips. Before they manage to go any further, they are interrupted by Ako who destroys the lipstick. Riko gives Keita another chocolate lipstick, however it was made from the horrible tasting chocolate that she had made, and leaves Keita comically half dead.

While Keita studies at school, Ako and Riko reminisce about their first year of junior high - the first time they were apart from Keita. Meanwhile, their teacher eavesdrops on their discussions and begins to worry about exactly what kind of relationship the have with their brother. After studying, Keita runs into Ako and Riko at the local shrine, where they were praying for his success.

While talking to his friends, Keita accidentally gropes his fellow student, Miharu Mikuni, and gets slapped. Ako and Riko become suspicious that Keita has been 'cheating'. When Keita goes to study at the library, Miharu, who is a student librarian, becomes too intimidated by her proximity to Keita to go to the bathroom, believing that he will grope her if she takes her eyes off him.

Suminoe siblings went shopping to Akihabara.

Toda convinces everyone to go to the pool.

Everyone goes to the summer festival.

Keita tries to get ready for the exams, while his sisters resort to supernatural means.

Keita got pyrexia two days before the exam.

Keita was not on the list of accepted students.

During the graduation ceremony Keita run out of buttons, which girls traditionally take as souvenirs even before his sisters arrived.