Ep. 1: Kouta and Mai care for a stray kitten until a tragic accident separates them.

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Grade school student Kouta Seto spends significant time with friend Mai Makihara, who suffers from frequent asthma attacks. While walking home, they discover an abandoned kitten in a park box, which Mai names Blue. Persuaded by Mai, they relocate the cat to a nearby shrine, visiting daily to feed it. Mai eventually recognizes that her condition limits Kouta’s social interactions with other peers. Kouta agrees to join a soccer match while Mai visits Blue alone. Heavy rain falls as she travels home, leading to her hospitalization and subsequent death. Kouta blames the cat for the tragedy and intends to abandon it. However, a shinigami named Momo intervenes, offering Kouta the opportunity to speak with Mai one final time.