His son, Hiroshi, had a secret crush on his mother, Natsumi, who raised him single-handedly, and prayed for a little happiness, saying, ``Let's just stay together...'' However, unaware of Hiroshi's feelings, Natsumi begins to fall in love with a man at her workplace, thinking, ``It's time for my own happiness.'' Hiroshi suppresses his jealousy and sends him off on a date with a smile on his face, but his feelings don't go away. That night, when I suddenly woke up, Natsumi and a man were intertwined at home.