Asakana, 17 years old, is a second-year student at Yaei Academy. Due to an accident six months ago, she has been suspended from school at home. This accident caused Nana to lose her previous memory. When she woke up in the hospital, she only remembered a boy named Ren. In early April, Nana finally returned to school. But on her first day back at school, she sprained her foot and met a gentle boy, Miei's student council president, Jun Akizaki, who sent her to the infirmary. In the infirmary, Nana met a beautiful and strange woman named Xiaoqi. At this time, a beautiful boy took her out of the infirmary. She recognized him as Jin's younger brother──Imiya Sawaya. But Sawaya is not friendly to Asaka... And Sawaya's brother Iniya Wakahito is the fiancé of Nana's half-sister, Miki Kia. Ruo Ren is very indifferent to things, but he is considerate to Nana... Under such circumstances, Nana's memory begins to break free of paralysis... The story unfolds against this background.