[Ayana Mizuki] Mō ī yo, imōtoyo.

A curvy, bespectacled, twin-tailed heroine discovers that her playful, awkward flirtation with her brother has become a charged first-time encounter, her nervous stammering giving way to bold demands as they move from teasing in her room to an intense physical scene on the bed. Their rough, humorous banter masks a real emotional pull: she wants to keep him close, while he is surprised by her determination and concerned when she pushes herself too far. By the closing pages, the forbidden secret has softened into tenderness, with talk of being a couple, possessive memories, and a hope that this unusual sibling bond will never turn into strangers.