Two intense days of having sex with her homeroom teacher, Yuka, which you can't tell anyone.

My mother abandoned my father and ran away. Since then, my father began to violently pose a second to me whenever something happened. Meanwhile, Yuka-sensei was always on my side. No matter what I was doing, I started to think about the teacher, so I ran out of my house where I had no place to go and came to the teacher's house.