アカツキ

The oldest member of the Four Heavenly Kings, the mediator of the group.
He has a calm personality and contrary to his looks he doesn't like fighting.
He thinks the Demon King should have power and intelligence, so he chooses the 'perfect' doubly skilled Iroha as a candidate.
In order to watch over and confirm his skills, he disguises himself as a guidance counselor at the high school.