I'm confused who Kurumi is still. She's an orphan, who mysteriously transfers to Aiba's school, and has connections with the OBs. If the OBs want to "assassinate" the current Roman club members, why does she never take his virginity? Or is she paid to make him become a less feckless human? She gets free healthcare and housing I assume from the rich doctor OB, but what's in it for the OB?
(I wonder if, rather than the free college etc being a reward for their virginity, it's more like compensation; if they didn't get their chance to grow up in high school, they get a second one in college.)