Michika is happy that her daughter Mika will be living with her after her marriage. However, her joy is short-lived as Mika tells her about her marital troubles... Apparently, Yosuke's sexual desire is too strong and he is not getting enough sleep. However, for Michika, who is sexless, this is an enviable problem. One day, when she goes into Yosuke's room to wake him up, she finds him masturbating. Seeing this, Michika can't help but say, "I'll satisfy you in place of my daughter," and gently starts stroking his penis...