From myanimelist.net:

We have met, for each of us to walk forward.

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...

if you have watched anime like 5 cm per second, hoshi no koe, or hoshi wo ou kodomo, then this latest anime from Makoto Shinkai sensei is just for you