Tập 1: Kouta và Mai chăm sóc một chú mèo con cho đến khi một tai nạn bi thảm chia cắt họ.

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Kouta Seto, a young boy in grade school, spends a lot of his time with his friend Mai Makihara due to her constant asthma attacks. One day while walking home from school, they find an abandoned kitten (which Mai names Blue) in a box in a park, and due to Mai's persistence, they end up moving it to a nearby shrine where they take care of it by visiting it daily and giving it food. Mai realizes that she is preventing Kouta from playing with his other friends, and one day Kouta agrees to play in a soccer game while Mai goes to check on Blue. That day, it starts to rain, and on her way home, Mai is taken to the hospital and soon after dies. Kouta blames the cat for Mai's death and intended to leave it for dead, but Momo, a shinigami, intervenes and gives Kouta the chance to speak with Mai once more. (Source: Wikipedia)