[Inbou no Teikoku (IN-KA of the Dead)] Doushite Neteiru Ma ni Imouto no Nyokon ga Watashi no Nyoin ni Haittemasu no! (Love Live! Sunshine!!)

A quiet afternoon turns into a moment of unexpected sensation when one sister's secret desires find their way to her sleeping sibling. As the urge becomes impossible to resist, the tension builds between the two schoolgirls, leading to a series of intense, breathless encounters that push their relationship to a new level of intimacy. What happens when a peaceful nap is interrupted by a surprising sensation that they just can't stop?