Probably:
The bad-tempered football genius was put on the bench by the coach because he disobeyed discipline, so he quit the team and transferred to another school to play volleyball in Qingcheng.
After leading the team into the country, he received an invitation for intensive football training. When he came to Blue Lock, he found that they were all old acquaintances from the notebook.
The timeline is messy, first volleyball, then blue lock, then volleyball, and finally falling in love with the annoying people and the best captain Oikawa
Intention:1