The story follows a cat who has lived one million lives, never truly understanding the meaning of existence until its final life. Reincarnating repeatedly as various types of cats—some pampered pets, others wild strays—it experiences love, loss, and indifference without ever forming deep connections.
In its last life, the cat finally meets a white female cat who doesn't care about its extraordinary past. Through this relationship, it learns what it means to truly live and love, rather than just survive. The poignant ending reveals that after a lifetime of emotional detachment, the cat chooses not to reincarnate again, having found fulfillment.