decorated with four children: ming (played by liu leyumi), kyoko, mao, and xue. but the mother had to lie to the people around her that her husband went to work overseas and lived with her eldest son. the fact is that the other three younger siblings are "black children" because the four children have different fathers. they stayed at home and did not go to school. when his mother went to work in a department store, the young ming performed his parents' responsibilities on behalf of his mother at home. suddenly one day, her mother disappeared. she left the only 200,000 yen in cash and a short note to the children. after entrusting her younger siblings to ming to take care of her, she quietly ran away from home. the four children who know almost nothing about the outside world have to start facing a new life without any relatives and reason.