I Enrolled in the School of the Final Boss in a Baseball Novel

I endured the pain of an injury that took away my dream of becoming a player by reading a baseball novel. However, the protagonist of that novel abandoned his childhood friend, who had supported him throughout high school, and left for the United States, where he ended up with a manager there. Perhaps due to my anger at the ending where the childhood friend was abandoned, I ended up writing a comment that reached 57,000 characters. When I came to my senses, I found myself possessed within that world.