Karin Tachibana

In bustling Shibya, Momose sees his high school classmate Yashiro. Yashiro is dressed as a girl. Momose continues to observe Yashiro and becomes attracted to him. Meanwhile, Yashiro becomes embarrassed that Momose knows that he dresses up like a girl.

Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.

Two same-age girls become stepsisters overnight and, left to live together, slowly turn awkward cohabitation into a warm bond as cooking and shared meals help them open up to each other.