[Umemaru] Kawaii Ototo no Ijime-kata (Noukou Dorori)

A confident, big-breasted sister turns an ordinary bath with her shy younger brother into a playful but increasingly transgressive encounter, sharpened by his protests, her teasing, and the beer between them. Their physical intimacy is interrupted by a cryptic phone message about the boy’s virginity and the arrival of another woman, complicating the supposedly private encounter. Exaggerated expressions, elastic motion, and stark monochrome art lend the taboo premise a mischievous, deliberately absurd energy.