Yuji can't hide his joy when he finds out that his mother's friend, Rinko, whom he has admired since childhood, is staying at his house for work. He is Kokoro to host her, but Rinko's work is not going well and she seems depressed... That night, while the two of them are drinking alone, Rinko, who is in a state of frustration, approaches Yuji in her drunken state. Yuji is swept away by the invitation from his beloved... The two continue to secretly enjoy each other's pleasure. However, before they know it, the end of this sweet time is approaching...