The Showdown Will Be Decided by Battle Fuck

A fantasy RPG where the Hero awakens in an alternate world ruled by demons where conflicts are resolved through sexual combat rather than violence. The protagonist teams up with Riina, a succubus, to reach the Demon King's Castle by ascending the demon ranks and facing the Four Heavenly Kings. The game features turn-based combat with a "Battle Fuck" system where the loser of each encounter must submit to the winner. Defeat accumulates penalties that increase damage taken, but players can skip intimate scenes and use cheat abilities to speed through gameplay, making it completable in a single evening.