AneTra! ~Onee-chan to H na Training~

Keisuke is a university student. He lives alone and enjoys his school life. One day, his cousin, Itsuki, suddenly comes to his apartment. "Let me stay here until I find a place to live." And he reluctantly begins to live with her. One day, he accidentally sees her naked body. But he has a secret that he only gets sexually excited by anime or game characters. She is surprised to hear that, and tells him, "I'll give you sex lessons then...."