Middle-aged businessman Ryoma is reincarnated in a magical world by three gods. He's a child again, and he spends his days with his tamed slimes.

Takao, who is training to become a shoemaker, skipped school and is sketching shoes in a Japanese-style garden. He meets a mysterious woman, Yukino, who is older than him. Then, without arranging the times, the two start to see each other again and again, but only on rainy days. They deepen their relationship and open up to each other. But the end of the rainy season soon approaches …