U19

U19 is a manga written and illustrated by Yuuji Kimura. It was serialized in Weekly Shōnen Jump.

Plot
Year 2036, Japan is under the adult party power and make children's life miserable. But for "rebelious-edgy-teenager-with-funny-scar" Kudo Eiji, It doesn't matter because he has his childhood friend Akari to cheer his everyday life. For Eiji, Akari is his emontional mainstay. Someone that can make him calm.

But then, one day adult party decide took Akari and transfer her to another school. It emotionaly stress Eiji out. Little did Eiji know, this awaken some power inside him.