At the End of the Dangerous Run - S1.E6

Makina defeats the SUV corpse after being assisted by Keisei. The rogue priest is revealed to be Akasha, a member of the Kougun cult who went underground due to his radical views of using Corpses as instructed. Keisei uses a cube filled with the blood of dead corpses as a shield to temporarily defeat Akasha, who retreats. The entire Kougun cult is shocked to learn that Akasha has resurfaced while contemplating plans to reinstate Keisei back with them.