Need help finding an old story (INK)

hi guys, I’m looking for a very old (ink style) story. It revolves about a girl who discovered her dead parents were part of a secret organisation (with Midnight in its name). She meets their agents (notably a guy she starts to get close to and his ex, a purple haired cold girl, think her name was Darcy). The organisation’s chief is her uncle, and they all fight against another group / agency (who are later revealed to be the good guys in the story, and MC will chose to fight with them and put an end to her uncles agency).
If anyone knows which story I’m talking about or can find the name I’d be really grateful. Thank you !