The story revolves around Tomoya Mizuhara, a 13-year-old boy who suddenly gains a big sister when his father remarries. 17-year-old Ichika is a little strange, and her affection for Tomoya is rather overwhelming, if not scary. On top of things, Ichika's friend Ruri is the ultimate sadist. Then there is Ichika's big-breasted quarter-Japanese friend Marina. (Source: ANN)

Manga club members Ai, Mai, and Mii continue their everyday absurd antics as they progress through high school alongside their upperclassman Ponoka. Whether the girls are drawing manga, joking around, or discovering odd creatures, they never run out of new ways to have fun together and grow closer as friends. [Written by MAL Rewrite]

Hayato Izumi, an introverted and studious high school student, is running for the position of student council president. However, his ambition is soon shattered by his rival, Ui Wakana, an outgoing person focused on the noble goal of improving school life through love and sex education. Accepting his loss, Hayato takes on the role of vice president. Shortly after the election, Hayato is met with a surprise: Ui announces that she will be moving in with him—as his wife! Although initially hesitant, Hayato discovers that this marriage was arranged by their parents, and he eventually complies. Now that they are welcoming a new beginning, the couple must learn how to live with each other while keeping their unconventional relationship a secret from the entire school. [Written by MAL Rewrite]

Some time has passed since student council president Ui Wakana and vice president Hayato Izumi got married due to the agreement their parents made. While they still try to avoid unnecessary attention by keeping their unusual relationship a secret from the public, the two frequently misunderstand each other's desires. However, as Ui and Hayato continue working in the school's student council and spending time together at home, the peculiar couple gradually grows closer. [Written by MAL Rewrite]