MKON-022 My older sister became a student teacher and protected me from the DQNs. Nozomi Arimura

My sister's dream is to become a school teacher. This time, she will be in charge of our class as an education trainee. I want my beloved sister to work hard and achieve her dreams. However, our class is full of DQNs and the classroom has collapsed. As her brother, I'm honestly worried. The cute girls in our class have all had their virginity taken by those DQNs. If those DQNs lay a hand on my sister...I can't sleep at night thinking about it.