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This is one of those reincarnated/transmigrated (I forgot which specifically) as the villainess tropes where MC is into the very minor character of a otome video game where ML is just the merchant. So when she gains awareness on which story she reincarnated, she focuses on gaining affection of the ML instead of the actual perviously romancable characters.
The manga should also be "completed" but if I remember correctly it simply got axed in the middle of the story :(