Abandon-100 Nukishinai to Derarenai Fushigi na Kyoushitsu / Mysterious class from which no one can escape until they cum 100 times

The students find themselves locked in the confined space of their school with a mysterious being named "Ruler" and are forced to participate in a dark sex game by the will of mysterious forces.

The story features a battle royale element where players, using their "game skills", try to make each other cum, for example, transform into a demon, releasing lewd tentacles from themselves, or using futanari torture.

The game host is a certain "Ruler" who watches the beautiful girls as they bring themselves to orgasm in humiliating games using lewd techniques and body modifications.