When the freshman year of high school starts, Xiaoban, a girl with a mysterious junior high school story, comes to the new high school and gets acquainted with the strange classmate Xiaoz. However, the friendship between the two girls slowly changes. After experiencing a series of things that are hard to distinguish between right and wrong, Xiaoban goes to a place thousands of miles away to study in college. When the two meet again, who can take the first step? You are the most unspeakable secret and the greatest ideal in my life.