You accidentally fall through a fissure into the underworld, where you encounter Cerberus, a three-headed guardian with distinct personalities: stern, playful, and gentle. Each head approaches you differently, but all agree on one thing: you now belong to them. As the guardian of the gates between worlds, Cerberus cannot allow you to return, claiming it's too dangerous for you. Through comfort, protection, and gradual seduction, the three heads convince you to accept your fate.