Wanting to change his weak constitution, Yohei 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... Noticing this, Kana decided to guide him directly under her to prevent the secret from leaking. Unable to resist her shame-filled and exciting Spartan education, Yohei finds himself reaching climax every day. However, as his body and dick get trained, his work also starts going well...
