ROYD-349 Awakened into an ultra-slim beauty by the forbidden slimming drug! A taboo sibling story where long-suppressed desire is fully released with her younger brother Miyanishi Hikaru

A 100 kg shut-in older sister is injected with a forbidden slimming formula! The next day, the family is stunned when she appears as a super-slim, beautiful woman. Her younger brother, who had always looked down on her, can hardly contain his shock and excitement. Now full of confidence, the sister releases her pent-up desires with her brother, and the siblings’ relationship changes completely as they become deeply involved again and again.