Yakyuken

Win at rock-paper-scissors, get laid. That's the whole pitch, and it's stated flatly enough that you believe it. Cham Cham Cham and cocktail mixing get added in as the rounds go on, but the core loop never pretends to be more than a hand game with clothes on the line.

The four chapters follow multiple heroines down branching paths, with wins peeling off outfits and losses presumably not. Special cutscenes and endings only open up once you've actually beaten someone, so the story rewards playing rather than clicking through.

A later chapter drops the stripping rounds entirely in favor of story-heavy special matches, which is a real shift in pacing rather than more of the same game. Everything is voiced, which keeps the repetition from going dead silent.