Mii narrates the story, observing the shifting relationships within the Okamura family. Kōji Okamura first brought Mii home as a kitten to soothe his young daughter Aya during her mother Minako's extended overseas work assignment. Now elderly and frail, Mii lives solely with Kōji after Aya moves away for work, becoming his constant companion in the family home. The cat's death draws Aya back, enabling a reconciliation between father and daughter. After Mii passes, Kōji adopts a new kitten, signifying a fresh start in the family's bonds. Mii's narration reflects on their shared history and voices a final longing to see Kōji and Aya reconnect before dying. Both Mii's life and death directly trigger crucial emotional turning points for the family.