Yui accidentally finds out the cause of her mother's death--Keiichi has a mistress at the office. Yui asks Mita to reveal the affair to Keiichi's colleagues, and Mita, being a loyal employee, agrees to do so and makes a crazy move.
Keiichi leaves home and only the kids remain living in the house with Mita. Worried about the kids, Keiichi's father-in-law tries to adopt them. Meanwhile, Kakeru rebels against his family and gets in trouble with the police.