There are old materials about the whole of Slive Central, so the members of the archaeology department came to the local museum in School District 9. Wasuiho Usuki, the teacher who leads the exhibit, who is suspicious of the contents of the exhibition that is too bland and touches the terminal at the end of the forbidden area. At the same time, Enjoji Mike, a member of the club suddenly loses consciousness in the hall. Before he knew it, he was traveling to the gorgeous Yoshiwara promenade as a courtesan, Mitsuse.