Wanting to change his frail constitution, Yosuke transferred to the product development department of a fitness equipment manufacturer. One day, he arrived at work just in time and accidentally witnessed his boss Kana's secret... Kana realized this and began to personally train him so that he wouldn't reveal the secret. Yosuke couldn't resist her Spartan training, which was full of shame and excitement, and he continued to climax almost every day. However, as he trained his body and his penis, his work started to go well...