Arahabaki Incident

The Arahabaki Incident (事件,) or the Impostor Predecessor Incident (偽り者先代首領事件,) refers to the incident of the Port Mafia deceased predecessor appearing at Yokohama, a plot made by Arthur Rimbaud to lure out the true Arahabaki, Chūya Nakahara. The root of the said incident happened nine years ago at the end of the war where a former national defense force was secretly researching an artificial ability-derived life form- known as Arahabaki.

Background
During the research of Arahabaki, Rimbaud and Verlaine - two European agents, plotted to steal the Arahabaki and managed to succesfully steal it. However, Verlaine escaped the military base and betrayed Rimbaud. This led to a vicious fight between the two which cause a light from their battle to scorched the night sky and eventually followed by an explosion in the area. During the battle, Rimbaud had to kill Verlaine and the large battle caught the attention of military's tracking unit. During Rimbaud's moments of being surrounde d by the military, Rimbaud absorbed Arahabaki which backfired on him and ends up breaking the seal of Arahabaki.

The breaking of seal of Arahabaki led to it leashing its true powers-powers that surpassed human comprehension. Arahabaki showed its true form - covered with black flames. After then, Arahabaki after being unleased, destroyed everything in the area: the military, the research facility where it was contained and the surrounding land from it which created the Suribachi City.

Failed to absord the true Arahabaki, Rimbaud spent years to slowly regain his abilities and plans a trap to lure out the true Arahabaki.

Aftermath

 * After Rimbaud's betrayal to the Mafia, his house was burned down and his possessions were thrown into the ocean. His body was left outside to the elements for a week before being buried in a rural public cemetery.