When her husband Koichi became an international airline pilot, his wife Akira moved in with her father-in-law, Toru. Before they got married, she worked as a flight attendant and met Koichi. Toru was her instructor when she was aiming to become a flight attendant. Akira had been in love with Toru since then, because he was strict but warm-hearted. To ease her feelings, she marries Toru's son... However, living with Toru makes Akira's feelings waver again. One day, Toru sees her masturbating while holding onto a uniform that Toru used to wear...