A sexual exorcism simulation ADV in which a sister possessed by a "liar devil" is disciplined by making her body "honest" through touching. Features touch-based Live2D interactions with themes of sister/nun, possession, shame, and sense of immorality in an erotic FLASH-style game.

The protagonist returns home to find everyone acting as if his deceased girlfriend Risa is still alive. When he visits her house, he encounters something unnatural wearing her form, leading to intense and forbidden sexual encounters.