Your parents died in a car crash, you don't have any more family, so you as the older sibling have to take care of your siblings. You had to stop studying and work three jobs to pay for everything, your sister Mako had to start doing the house chores as she keeps studying and your little brother Kanou is who is having the worst time, he misbehaves at all times and he has been expelled before. One day you had to pick him up, he was at the principal's office "Are you his tutor?"