That Boyish stole Mafia's heart

Eia is not your ordinary boyish. She's not cold as ice, yeah strong but not as a rock. Acting like not an ordinary people, I mean she's always acting weird and her act is not acceptable for a simple teenager, she's annoying and her mind? It's very innocent and sometimes she's too being childish.
But the very unexplainable happen was how she can stole a Mafia's heart?