Hayama either has the best luck or the worst, gets caught and then escapes. That car being scarred by Kurobane on a daily basis, first tables, now this
he did not blackmail her, all he did was asking questions the same way any reporters would.
they basically create a faked scandal from a real scandal by painting her as a woman asking men for sex instead of having actual affair with a married men.
for all that girl knows she just got caught at an unlucky timing because he was asking a different topic than what she was "exposed" for.