Dark History! The Worst Shinigami Is Born

Plot:

Koga Kuchiki escapes his confinement and in the process, kills the Soul Reapers who framed him. Although Ginrei sympathizes with his son-in-law's situation, he reprimands Koga for his rash actions. Enraged, Koga severs his ties with the Kuchiki clan and begins killing Soul Reapers and innocent people.