Phantom of Inferno details the life of a 15-year-old Japanese boy who is kidnapped after witnessing the killing of a reporter. The memories of his past life are erased, and he is given the choice to join 'Inferno' or die. After joining the organization he is given the name 'Zwei' and will study under 'Ein'. Ein is also known as 'Phantom', the title given to the organization's top assassin.
Inferno is said to be the 'United Nations of crime syndicates'. As Zwei makes his way through training and various missions, deceit and betrayal occur even within Inferno and slowly put Zwei in increasing danger. Along the way, Zwei meets a girl by the name of Cal Devens and, though he tries to protect her, she too is drawn into Inferno to become the assassin, 'Drei'.
The game is divided into three chapters. The first chapter deals with Zwei being turned into a killer and has two main "routes" to follow, the Ein route and the Claudia route. No matter which route is chosen, the chapter ends with Scythe escaping and Ein presumably dead, unless one opts to escape back to Japan. The second chapter starts off one year after the events in the first chapter, and deals with Claudia's plan to bring the Godoh group into the organization, Scythe's revenge, and the introduction of a new character, Cal Devens. It contains the Cal route and the final Claudia route.
In 2010, Nitroplus announced the game will be remade for the Xbox 360 featuring the same scenario but based on the designs created for the anime series from Bee Train. Character designs from artists Minkao Shiba, Yoko Kikuchi, Tomoaki Kado, Yoshimitsu Yamashita and Yoshiaki Tsubata were introduced into the 360 version. In addition the cast of the anime series also reprised their roles for the new version.
Source: Wikipedia, "Phantom of Inferno", available under the CC-BY-SA License.