Seifuku, Nugasete Ii desu ka? - Danshikou ni Joshi Hitori!?

Covering for her sick brother, university student Shiori Oshima attends his all-boys high school to take his exams. Looking almost identical, she doesn't expect to get caught?that is, until her teacher accidentally touches her chest. Another student from class overhears what happens and is now determined to tease and pleasure her for his own fun.