The Martin Experiment is an erotic comedy visual novel full of mysteries and conspiracies, and you play as Martin, a young man who has been abandoned by his father without any notice and left to fend for himself. Feeling betrayed and on the brink of losing his mind in fear of being evicted, Martin has let himself go, heavily neglecting his hygiene and sustenance.

But when a beautiful woman shows up at his door, Martin's life takes an unexpected turn. She calls him by name, but Martin has no idea who she is. Despite his reluctance to interact with anyone, Martin knows he must open the door and confront the unknown woman standing on the other side. What could happen from this encounter?