Hiroshi, a son who secretly had feelings for his mother Natsumi, who raised him alone, wished for a little happiness together, saying, "Just the two of us like this...". However, unaware of Hiroshi's Kokoro, Natsumi, Natsumi my own happiness," begins to fall in love with a man from her workplace... Hiroshi suppresses Kokoro and sends her off on a date with a smile, but he is unable to clear his mind. That night, he wakes up to find Natsumi and the man entangled in his house. Shocked and unable to sleep, Hiroshi calls Natsumi into his room the next morning...