Natsu to Hako

It is an anime adaptation of Doumou’s manga.

As Yoshi walks down a mountain trail, he meets a young girl in a phone cabin. The latter asks him for help since the phone is not working. However, when Yoshi walks into the cabin to help him, he finds himself locked up with the girl. Because of the suffocating heat, they begin to undress, and quickly, they give in to the temptation to discover new pleasures.