Atsushi is happy to hear that his mother's friend Airi, who accompanied her husband on an overseas assignment, is returning to Japan. When he meets her again after a long time, she has become even more beautiful than ever... As she helps her move, the two of them grow closer, and as their old feelings for each other overlap, they end up having a relationship. As the two continue to meet secretly, they are not only childhood friends, but also deeply connected by the bond of pleasure. However, Airi that she can't continue this way forever, and decides to end her relationship with Atsushi...