Takashi has fallen in love with Kanna, the mother of his best friend, and frequently visits his friend's house, his heart racing every time he spends time with her. However, merely seeing her face is no longer enough to satisfy his growing feelings. One day, by chance, Kanna asks him to give her yoga lessons, bringing them even closer. The sensation of their bodies touching, her alluring poses during yoga—each movement deeply stirs Takashi's emotions. Her beautifully shaped buttocks, the rhythm of her breathing in sync with her motions—yoga's sensual charm draws him in more and more. Though he tries to remain restrained, constantly reminded that she is his friend's mother, her presence pulls at his heart uncontrollably, ultimately triggering a profound change within him.