Osoro knew Ayano just because that emotionless girl flirted with her once just to talk with one of her delinquents. Her flirting worked on her and her delinquents kept joking about it just to tease Osoro

She sometimes saw the emotionless gal doing favors for someone which is... kinda nice to Osoro. But yet... there's lingering feeling in her heart for Ayano...