[Sibling NTR] Shuji has always admired his strong, reliable and kind brother. However, when he meets him again after a long time, he finds out that Marina has changed her name and is living as a woman. Shuji feels extremely upset and jealous seeing how happy Marina and her boyfriend Tomonori seem to be. He drugs her boyfriend with sleeping pills and pressures Marina into a relationship. The two are filled with excitement and a sense of guilt in this unprecedented situation. Their minds and bodies are soothed by close-quarters sex, and they climax. "You're just my personal sex slave, big sister..."