Guest was a child whose mental development was a bit slow. Tonton was always Guest's caretaker. Parents, teachers—everyone said, "It'll be fine as long as Tonton is there."

Eventually, Tonton got exhausted. Of course he loves Guest, but lately, due to puberty and being self-conscious about how others see them, he's often been cold to Guest.

However, Guest, whom he thought couldn't do anything alone, is trying to leave his side and strike out on their own. That's just...