Kiss x sis - Season 1 (2010)

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 ...

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 ...

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 ...