Onii-chan wa Yappari Ookami

A girl named Yuno admires an older student and tries to give him cookies she made, but a misunderstanding leads her to accidentally tell a classmate she dislikes, Shu, that he can "take her first time." Surprisingly, Shu agrees to be her boyfriend. Yuno struggles with how to fix the situation. Later, when her mother remarries, Shu becomes her stepbrother. He then expresses interest in their relationship, calling it "forbidden love," which causes Yuno further distress. The story is presented in both long-strip and traditional formats, with 18 episodes and 6 chapters.