KAMIGAKUSHI NO RAKUEN

The main character, Hinata Kuroto, is searching for her younger sister, who was supposed to have existed in the past, but no one around her remembers. Kuroto then receives a letter from a beautiful transfer student, Shimotsuki Shirai, saying, ``If you want to know about her sister's whereabouts, come to the library after school.'' When Kuroto goes to the library, he finds a half-naked Shirai waiting there for some reason. "Sex & Dungeon!!" A sex metafantasy drawn by manga artist Gensei Sahara!