Ryouta Kajiyama, a new deliveryman at Kaizuka Delivery Services, encounters an unexpected customer wearing a bunny head, the enigmatic Mamoru Aizawa. Despite his initial surprise, Kajiyama continues his deliveries and becomes increasingly intrigued by the mysterious figure. Worried that Aizawa might be a fugitive, Kajiyama's perception of him shifts as they develop a unique bond through their interactions. However, their smooth dynamic faces a twist when Aizawa reveals his true face, leaving Kajiyama in uncertainty about their future encounters.