Hey, looking for a specific manga. The hero, was either a real person playing a game who beat the game or was part of that world already and killed the villain, and became/was forced to take the place of the villain. I don't know if it was a game and they were forced to become the big bad boss or what. But I've been trying to find it for a while now.

Would appreciate the help.

It rings a bell... I think I remember reading some of it. It wasn't A Fairytale for the Demon Lord was it? I don't think it is but it might jog your memory by comparison.

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Quote of the Year (2017): "The mind is its own place, and in itself can make a heav'n of hell, a hell of heav'n." -John Milton

That looks super interesting. But it's not that one. But it did help me remember part of the plot of the one I was looking for, cuz the manga I was looking for had a similar look for the main character.

I was thinking of https://www.mangaupdates.com/series.html?id=116409

Thanks for the help!