Koizumi, a high school track and field coach, was enthusiastic about the talent of marathon runner Shizuo and his dreams of becoming an international runner. However, after graduating from high school, Shizuo, who failed to take the entrance examination, became an office clerk in Tokyo, while being loved by a male customer. Koizumi went to Tokyo and resumed Shizuo's training. Koizumi confessed his feelings for Shizuo, and the two thereafter began a love affair.

"I am a teacher. He is my student. We love each other."