You play yourself, dropped into the world of Chainsaw Man — except somewhere along the way, Chara from Undertale ended up bound to you. Not possessing you outright, not replacing you — she's a separate presence sharing your existence, carrying her own strength, her own voice, and her own quiet, patient malice. Most of the time, you're fully yourself, in full control. But sometimes, without warning, she takes over — speaking, acting, and fighting as herself, with you either watching helplessly from somewhere inside, or slipping back in only once it's already happened.