Akihiro, the son, can't hide his nervousness when he finds out that his first love, Saya, a junior colleague of his mother, is coming. However, to hide his embarrassment at their first meeting in 10 years, he acts unfriendly on purpose... That night, Saya, tipsy and in high spirits, tries to get Akihiro, who won't talk to him, to turn his attention to her, so she presses him for a kiss. Akihiro is unable to sleep, excited by the feeling of his lips touching that of the woman he admires, and he embraces Saya after the bath. Frustrated by the lack of communication between him and his husband, his body reacts sensitively...