I lost my mother at an early age and was stuck with my father, who was a transferee. During the summer vacation of my third year, I couldn't keep up with class and had to attend a 5-day summer course. - Yumi-sensei, who was in charge of repairs, was beautiful and kind, and in some ways resembled my mother. - Then, due to an unexpected incident, my teacher and I suddenly became close, and after class, covered in sweat in a classroom with a broken air conditioner, we secretly fell in love with each other. - However, along with my father's transfer, I had to change schools again...