I don't honestly know if this idea has been used.
A little girl is sent to become a test subject. She is around the age of 6 or 7, and has no idea about the hell that's in store for her. As she grows older, she gets smarter, until one day she uses her smarts to escape. She picks up a job as a gangster, and meets a boy. This is the part for love, right? Wrong. This boy doesn't even like her, much less love her. He bullies her to the point that it is considered abuse. This continues as what scraps of humanity she has left burn out. So she makes an escape, the form of escape can be up to you. UwU
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GLMV Ideas
RandomMost of these are just shower thoughts, but if any gacha tubers find this, then feel free to use these plots.