Mother Michika is happy that her daughter Mika will continue to live together after marriage. However, her joy is short-lived as Mika confides in her about the troubles of married life... Apparently, Yosuke's libido is so strong that he suffers from sleep deprivation. But for Michika, who is sexless, it was a desirable trouble. One day, when she enters the room to wake Yosuke, she finds him masturbating. Unable to restrain herself, Michika says, "I'll take my daughter's place and satisfy you," and gently begins to stroke his penis...
