Takeshi visited his best friend Shogo's house, where he encountered a beautiful woman he had never seen before. She was Shogo's older sister, but her stunning beauty left Takeshi utterly astonished. The next day, Takeshi was called over to their house to pick up a forgotten report, and once again met the gorgeous woman. The older sister paid special attention to Takeshi, gradually drawing him in. As they spent time together, Takeshi felt an intense, overwhelming desire toward her body, unable to hide his shock. In that moment, his heart was profoundly shaken.