MKON-022 My sister became a teacher trainee and protected me from DQN Nozomi Arimura

My sister's dream is to become a school teacher. - Now, I will be in charge of my class as a teaching trainee. - I want my beloved sister to do her best and make her dreams come true. - However, since my class is full of DQNs and the class is falling apart, my younger brother and I are honestly worried. - All the cute girls in my class lost their virginity to DQNs. - I can't sleep at night thinking about what if the DQNs mess with my sister...