The story takes place in a senior high school. Liu Jiali, a girl from Class 6, the third grade of high school, who ranks first in the school examination for ten thousand years, fell into the grass in the teaching building in the physical education class. Witness Xia Yi fell ill and was hospitalized. Xia Yi's childhood sweetheart Mu Yu was Liu Jiali's boyfriend and defeated Liu Jiali in the examination. Li Si sat on the throne of first place, but his temperament changed drastically because of it. He Ze, who also grew up together and was the last in the grade, fell into this shady situation and couldn't extricate himself. The truth gradually emerged, but was blocked by a strange man. However, more and more people were involved in this tragedy that seemed to be suicide. There is no horror in youth, the story continues.