Acma:Game

Acma:Game (アクマゲーム) is a manga series written by Mebu and illustrated by Kouji Megumi. The series started serialization in Weekly Shōnen Magazine in 2013.

Plot
The manga centers around Teruasa Oda, a high school senior gifted in smarts, looks, and money. This seemingly perfect scion of Japan's powerful Oda Group gets caught in a nightmarish game with the son of the Belmont mafia family's boss.