"I want you to train me," a mysterious young man named Jin suddenly appears before Shinobu, a trainer working at a gay sex establishment.

He learns that the man he likes has told him, "I can't do this to you as a boyfriend, but I'll do it as a sex friend," and so he wants to work hard at sex, but he's not doing it well. He seems desperate, fearing he'll be dumped if he carries on like this. Shinobu is shocked and thinks, "What a stupid idea..." but reluctantly accepts , saying he'll do it as a job . And that's how the two first met.