Lust Theory: Season 1

The main protagonist is a student who lives with mother and two sisters (younger one who goes to same class, and older one). He's just at that age when his hormones are raging and he isn't really picky, especially since all around him are hot girls. Whether that's his childhood friend, new transfer student, his chemistry teacher, or even his sisters. But choices have consequences, so there are borders to be enforced... but, once he finds himself in a time loop with same day repeating itself over and over again, he starts feeling more inclined to take chances.

The game doesn't focus on selecting a single heroine and instead requires the player to go through the story with all heroines, and uses hint system to help the player with what he has to do next to progress the story with specific heroine. Occasionally red button appears on the screen which shows alternate render of the woman in the scene, either naked or wearing something provocative. Rounded arrow icons, when available, cycle through several different angles of the scene.

Game uses full voice-acting for all female characters, including for what they're thinking. Player can use in-game smartphone to check walkthrough, go through unlockable gallery or re-live specific scenes. Upon finishing the game, a bonus Christmas spin-off story becomes unlocked.