[Chijoku An (Momochamaru)] Ani ni Natta Kaki-chan to Imouto ni Sareta Touki-kun

A brother and his younger sister undergo a dramatic gender swap that forces them into reversed sibling roles, with the former now dressed as a girl and the latter as a boy. The brother, embracing a dominant, femdom stance, teases and controls his sister, who must obey and become his submissive 'little sister.' As they navigate school hierarchy and personal identity, the story builds tension around power dynamics, self‑discovery, and the evolving bond between the two.