After her husband, Koichi, becomes an international airline pilot, his wife Akira begins living with her father-in-law, Tohru. Before marriage, Akira worked as a flight attendant—the very place where she met Koichi. Tohru once trained aspiring flight attendants, and during that time, he strictly supervised Akira as her instructor. Despite his stern demeanor, his warmth left a deep impression on her, and Akira secretly developed feelings for him back then. To suppress those emotions, she chose to marry his son instead. However, living under the same roof with Tohru reawakens her buried desires. One day, she is caught by Tohru himself while masturbating while holding his old uniform. That single moment intensifies the turmoil within her heart, pulling her deeper into conflicting emotions.