Very similar-looking game but online-only with an energy system and MTX:
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Right off the bat, I can't tell if it's actually brainwashing though. If it's some contrived "romance" hero fantasy thing, I'm not interested. I guess I'll get to the second girl and we'll see. Edit: nvm, store page says it's romance. doing quests for others and being kind, because that's what you want to be doing as a dark overlord I guess.