Atsushi was genuinely delighted to see Airi, his mother's friend, return to Japan due to her husband's overseas transfer. Reunited after a long time, she radiated an even greater beauty, stirring unexpected emotions within him. Helping her move brings them closer, rekindling feelings long buried. Soon, they become lovers. In secret, they continue their affair, deepening not only their childhood bond but also a new, passionate connection filled with pleasure. Yet, knowing this relationship cannot last forever, Airi resolves to end things with Atsushi.