Momo is married to her current husband and has a worry-free life, but there are some things she is not satisfied with. One day, Momo attends a class reunion and meets Sato, her first love. Even though they used to love each other, it was Sato who turned Momo into a woman instead of his wife, but they both never expressed their feelings. This time, Sato doesn't want to have regrets anymore, so he proactively confesses to Momo, something he has not dared to do for many years. They have a cheerful conversation, Momo drinks a bit too much and quickly gets drunk, so Sato takes her to a hotel to rest. Seeing his beautiful and seductive ex-lover in front of him, Sato uses the excuse of being drunk to have her once again. Although Momo protests verbally, her body always responds to his every touch. She also remembers the pleasure that Sato brings, something her current husband cannot provide. From then on, Momo constantly lies to her husband to meet Sato, and her husband, trusting his wife completely, never suspects anything...