Hoichiro Ohma works in an office. Everybody knows him as a silent, humble man. Even his girlfriend, Nanase, doesn't suspect that he could be something more, but he is. When a person dies as a victim of murder; when someone kills himself with a curse on his lips; when someone's death needs to be judged, he is there, for he is a Judge Of Darkness. Following the Laws Of Darkness, with a book made of human skin and an unusual parrot, he pronounces judgement over living criminals that would otherwise go free.

Famous for his military service in the 39th Asian War, the legendary Swiss robot Montblanc is violently murdered. Humans and robots around the world mourn for the beloved celebrity. Montblanc's popularity only grew in the years following the war, thanks to his dedication to nature conservation and his loving personality. Once a fellow war veteran, robotic Europol detective Gesicht is sent to investigate Montblanc's tragic demise. In his pursuit, Gesicht uncovers evidence of a mysterious entity known only as "Pluto." He also learns of a conspiratorial plot to dismantle the eight specialized robots from around the world who participated in the war. Racing against time to save those who still remain, Gesicht grapples with his memory, morality, and a world full of hate, desperately attempting to defend the fragile coexistence of man and machine.

The warriors who have been warped by the rampaging power of Justice have been summoned into the world of Xanadu. It is up to Dark Fact, a former villain, and principal Lappi to re-educate these students.

Characters from various games released by Falcom (e.g. Dragon Slayer, The Legend of Heroes, and Ys series) come together in a school.