As the track team's advisor, Mako Oda had been diligently supporting her husband. One day, a team member named Takeda came to her home injured. While caring for him, she began to sense the hidden desire within his body. Having been in a sexless marriage for years, she eventually succumbed to Takeda's aggressive advances. Through fellatio, he gradually took control of her heart. Under the pretense of supporting the track team, their relationship grew deeper and more intense.