Villainess Level 99: I May Be the Hidden Boss But I'm Not the Demon Lord: Season 1, Episode 12 - ProjectFreeTV

1 - 12: The Hidden Boss Battles the Demon Lord

At long last, Yumiella and her companions reach the Demon Lord's castle, but his power is so great that she's the only one who stands a chance against him. Then the Demon Lord tells them the true story of his connection to Valschein's royal family.