In a post-apocalyptic world ravaged by an unexplained epidemic that decimated humanity within six months, Hazufumi, a lone survivor, shunned meaningful connections to avoid the anguish of loss. However, his solitary existence takes an unexpected turn when he encounters a peculiar girl trailed by a legion of felines. This chance meeting with the enigmatic girl and her entourage of cats sparks a transformation within Hazufumi, challenging his resolve to remain detached in a desolate and empty world.