The heroine has a lively and cheerful personality. She likes to watch anime, especially pure love. She also likes to watch BL, including BG, BL, and pornographic movies. She is often in heat, eats quickly, runs very fast, and often fantasizes about falling in love with handsome guys. The male protagonist is handsome and has a high IQ. The male and female protagonists are happy enemies. The male and female protagonists fall in love with each other while getting along. The heroine takes the initiative to confess to the hero. The male and female protagonists are estranged due to a misunderstanding. The heroine was deeply affected. Later, due to being humiliated and various incidents, the heroine suffered from depression and became an unintentional doll. She lost part of her memory and her mental age was that of an elementary school student, still in a lower grade. After the heroine suffered from depression, her temperament changed drastically. She was not interested in anything, had no enthusiasm, and no longer liked the things she liked before. She was indifferent. She had two personalities, one was an innocent primary school student, and the other wanted to take revenge on society, kill people, and do bad things. The heroine switches between these two personalities. After the heroine suffered from depression, she accidentally met the hero again and felt that the hero was familiar and magical. The hero's personality changed because of falling in love with the heroine, and he became a personable gentleman. The hero and his friends desperately try to stop her dark personality and help her return to her former self. The hero and heroine spend the spring, summer, autumn and winter in school with their friends. There are all kinds of classmates in the class, different life experiences, some funny daily life, some sad scenes, and the gradually warming relationship between the hero and heroine. They experience the pressure of college entrance examination, study hard and all kinds of hardships and finally have a happy ending. In the end, the heroine returned to her lively and cheerful time because the hero had a heart.