Acma:Game is a Manga/Manhwa/Manhua in english language, : Shounen series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

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.