A female married woman teacher has a sweaty lesson in the middle of summer.

I grew up in a single-parent family, and although I attended school, I secretly worked in a factory. Mizuhara-sensei treated me kindly, as I had no time to go to cram school and was late in studying, and was avoided by my classmates. I admired Professor Mizuhara, who was beautiful and kind. Then, in the summer of the third year, he suddenly got close after school alone with Mizuhara-sensei. On a hot afternoon, when classes were over, they secretly sought each other all over the school, covered in sweat. At this time, I thought that these happy days would last forever...