【Sibling NTR】Shuji, who has always admired his strong, reliable, and kind older brother. However, when they reunited after a long time, she had changed her name to "Marina" and was living as a woman. Shuji feels intense turmoil and jealousy towards the happy couple of Marina and her boyfriend, Tomonori. He puts sleeping pills in his boyfriend's drink and forces himself on Marina. The two of them, in a situation they've never experienced before, are overcome with excitement and a sense of transgression. They are healed in their hearts and bodies with zero-distance intimate sex and reach climax. "After all, my older sister is my meat toilet..."