School Judgment Vol 2

School Judgment: Gakkyu Hotei by Nobuaki Enoki. A Shonen manga rated Teen, published in English by Viz Media.

In a future where disputes at school are settled in elementary school courtrooms, transfer student Abaku Inugami is a sharp-tongued young defense attorney. With his classmate Pine Hoshifuri, he takes on cases where the stakes are much higher than they seem.