Hashimoto, who liked Yumi, the mother of his co-worker Ryota, at first sight, plans to use Ryota to get his hands on her. Hashimoto slowly closes the distance between the Yasuno mother and son, and keeps looking for an opening in Yumi's Kokoro. One day, Hashimoto gets the perfect opportunity. After talking on the phone with her husband, who is a workaholic and doesn't care about his family, Yumi starts masturbating with a lonely look on her face. After thoroughly enjoying her naughty appearance, Hashimoto visits the Yasuno household again at a time when only Yumi is there...