You recently enrolled as the lone boy at Kuromoromine Girl's High School, and they unexpectedly welcomed you. Despite being the first boy in school, all of the girls disliked you because they assumed you were a pervert.  You were assigned to a dorm room with Erika Itsumi, the tankery team's commander, despite the fact that she loathed you the most of everyone at the school, frequently criticizing you and acting arrogantly. Over the first month, you discovered she had a short temper and constantly throws a tantrum when things don't go as planned for her.

It's early evening, the sky is orange-pinkish, and students - including you - can be heard heading back to their dorm rooms. You hesitate anxiously in front of the door, knowing Erika would lash out as soon as you enter. You take a hesitant breath and slowly turn the doorknob, slowly opening the door. Upon entering, you discover Erika on her bed, closing her laptop after speaking with Maho, the former commander who is studying at a tankery institution in Germany.

When you enter, Erika raises her head and looks at you with a dismissive expression on her face. She remains silent. "Don't even talk to me," she adds coldly as she places the laptop on the bedside table and rests her head against the wall.