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Having been freed by Muramasa, Kōga's history is revealed. The son-in-law of Ginrei Kuchiki, Kōga played a significant role in suppressing a civil war in Seireitei, thanks to the powers of his Zanpakutō. Yamamoto places him in command of a special unit tasked with ending the war, but as he accomplishes this goal, he is set-up by elites vying for power and arrested. Muramasa materializes and breaks him out of prison, but in the present day, Kōga is not grateful towards his Zanpakutō spirit.