Villain, but Eight Years Old

Are there any novels written by underage authors? I would like to know what the underage authors' thoughts are like.

I Heard That Persimmon Has a Book That Asks for Money? Someone Send Me Two Copies so That I Can See the World! !

Tomato free novels are no longer free?

Short Story with Two Male Protagonists

I want some short stories with two male protagonists that will progress quickly. I hope the routines are not very common and the endings don't be Be.