Kamen Rider Black Sun S01 E04 Episode 4

"What is evil? Who is evil?"

Nobuhiko, together with the kaijins he gathered, tries to recover the former Gorgom. An old friend visits him and informs him that the Kingstone is under Aoi's care, so he goes to Kotaro... Meanwhile, Aoi is happy to see her father, Hideo Kawamoto again. However, Aoi is suddenly pursued relentlessly by her father who has turned into a kaijin. But she is saved by an unexpected person.