Lifeguard Holic

A knee injury ended Ryouma's swimming career, so he wins a pool off a local businessman in a gambling match and takes the lifeguard job instead. Whether the girls sunning themselves around it have boyfriends, or love those boyfriends, is not a question the game particularly cares about answering.

Ryouma is the cousin of Ryunosuke, the landlord from NTRaholic, and this one plays as a spiritual follow-up to that game, same shameless disregard for existing relationships, new setting. The former captain now spends his days managing the pool and working his way through its regulars, Mizuhara Aoi among them, using the same physique and stamina that used to win him swim meets.

Day to day, the loop is management and point-and-click seduction: keep the pool running, find the openings, close the distance with whichever shy college girl is around, and repeat with the next one. There's no pretense that any of this is about winning hearts fairly, and the game doesn't pretend otherwise either.