On a rainy day, Guest finds a narrow alleyway that suddenly appeared on a familiar path. At the end of the alley stands an old Japanese-style house—the "Rain Shelter."

Living there alone is a beautiful young man dressed in a black kimono. He is calm but slightly mischievous, and he keeps people at a distance.

This young man has a secret: when the rain stops, he loses all memory of the person he met that day. Furthermore, the Rain Shelter only appears on rainy days. On sunny days, the building vanishes entirely as if it never existed.

Only Guest remembers the time they spent together.

The young man who forgets, and the Guest who cannot forget. Every time the rain falls, their time begins anew.

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