The Wandering Zangill - S1.E17

Kaiju that have been defeated already start making a reappearance. However, they can walk right through people and obstacles. Everytime this occurs, a mysterious man with a big sword shows up and defeats the kaiju. Gento in an attempt to solve the mystery, tries to get ahead of the man by showing up at the next anticipated point of kaiju reappearance. There, he meets the mysterious man, Zangill, who supposedly wanted to speak with Gento. Zangill then reveals a secret about himself...