Before Kokushibo could land a final blow, Yoriichi died of old age. Despite winning, this angered Kokushibo even further as he lost his only chance of a fair fight, and his brother died remaining ...

In doing so, Michikatsu became one of Muzan’s Twelve Kizuki and changed his name to Kokushibo, making him slowly descend into the dark path. He made it his mission to defeat Yoriichi ...