A boy forgets a promise to a ghost, then remembers it years later. That single premise contains every weight that matters: the shame of growing up, the things we abandon without meaning to, the possibility that someone has been waiting. The ghost doesn't demand payment or revenge. It just stands on that bridge in the rain, still believing in a kid who stopped believing in it.

The second story in The Lion Books series, this one-episode fantasy OVA begins when a boy meets a small, lonely umbrella ghost who wears geta. He promises the ghost a pair of rain boots, and in exchange he is granted three wishes. As the boy grows up, the promise slips completely from his mind. Then one day the memory of the Rain Boy returns, and he hurries back to that bridge in his hometown. The result is a sweet, touching hometown fable about a gentle ghost and a promise that was forgotten.