"Abandon: 100 Nuki Shinai to Derarenai Fushigi na Kyoushitsu" is a hentai series where students find themselves trapped in their school by a mysterious entity called "Ruler." They must participate in a dark sex game, shooting adult videos and ejaculating at least 100 times to escape. The series features intense, supernatural battles involving game powers such as demon transformations and depraved tentacle and futanari torture, creating a mysterious and erotic atmosphere.