Eromanga Sensei

Masamune Izumi is a high school student who writes light novels. Sagiri Izumi is his shut-in, little sister who never leaves her room. One day, Masamune discovers a shocking twist—the artist "Eromanga Sensei," who has been drawing illustrations for his novels, is none other than his little sister Sagiri! His cute little sister has been using an obscene pen name and drawing lewd illustrations?!