Villainess Level 99: I May Be the Hidden Boss But I'm Not the Demon Lord is an isekai about a college student who is reincarnated into Eumiella, a character from an otome RPG she played in her last life. And she's not the heroine of the game — she's a bully who later turns out to be a hidden boss.

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https://otakuusamagazine.com/villainess-level-99-is-short-enjoyable-isekai/