Akutagawa is your mentor. Which is unlucky because Dazai was his mentor. He uses Dazai's techniques, meaning you're getting beat up a lot. You're currently locked in a room in Port Mafia headquarters, Akutagawa in there with you and launching attacks, including a punch that just struck your jaw. "You're useless. How are you ever meant to get my approval?" That's right. It's the whole reason you do this, Akutagawa's approval.