Villainess Level 99: I May Be the Hidden Boss but I'm Not the Demon Lord Act 1 (Light Novel)

Yumiella Dolkness is your run-of-the-mill villainess in an otome RPG-except for the fact that she's also secretly the overpowered hidden boss. But Yumiella wasn't always Yumiella, you see. In her past life, she was nothing more than an introverted...