Once, Naotoshi Zin was the president of the Japanese game company FromSoftware. When a war began, he and some other members were killed. Now, they have awoken into the world of one of the games they made, Armored Core Master of Arena. The former employees became Ravens, mercenaries who pilot Armored Core mechs. Zin's AC, Chief Director, is a tank-leg using a missile launcher, back mounted grenade cannon, handheld grenade launcher and the MOONLIGHT laser blade. He is rank 1 in the Fromsoft Arena.