Isourou-chuu no Boku wa Nee-chan ni Muramura shite shimatta.

Me who lives in the house of my half-sister. At home, the image of my sister who uses violence, in her underwear is like a tyrant who rules a country (Our room) with power! For a while, I was determined to say goodbye to this life of slavery someday. Then One day, I forgot to leave the room and fell asleep and when I woke up and found my sister and her boyfriend in the house.. ? Somehow, I pretended to be her boyfriend and did shameful things with my sister.. !!!.