You're half right
Omg spill, please tell me what happens
Huge spoilers
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Not exactly science an experiment but she's the daughter of fuu-chan's dad and her mother. You're right that it was the brother who left her at the orphanage to get her away from the mother (she's insane). The dad didn't find her, the mom did but she knew from the start that she's in that orphanage
Thank you for the spoiler, this is sobinteresting. Does Fuu-chan know about this?
Sorry I'm not sure about the finer details :(
What if she's the product of some science experiment that has to do with time travel and that it was the brother who left her at the orphanage to get her away from the parents, but somehow the dad found her