To you, I will be staying at Yuko's house tonight.

Mizuki was living without any inconvenience with her husband. She begins to have a relationship with Kenji, a younger man she met by chance. Although Mizuki is satisfied with her current life, she seeks stimulation from Kenji, who openly expresses his love for her. However, one day, Kenji breaks his promise and comes to her house, and Mizuki kicks him out. After that, Mizuki loses contact with Kenji, but when she receives an e-mail saying "I miss you," she leaves a fake note and heads towards Kenji...