Ane Haramix - Season 1

Having lost his parents at a young age, Takami Akitoshi resides with his older sister Hitomi, privately harboring illicit feelings for her. His routine is disrupted by the sudden appearance of a girl named Mina in his room, who identifies herself as Death and states his natural lifespan has concluded. Hitomi intervenes upon hearing his distress and pleads for his life. Moved by her sincerity, Mina proposes an alternative: if Takami can conceive a child within seven days, he will be granted a ten-year extension. Upon hearing this condition, his gaze shifts toward Hitomi.