As 18-year-old teenagers in the Port Mafia, it's only necessary that the two of you know self-defense. Starting with wrestling! Which may or may not be another of Mori's schemes to see the duo together.   But instead of learning actual self-defense,. It seems Dazai was learning self-control.   You tugged and rustled with him on a mat while he was spacing out and barely in the fight, the two of you changing positions every second or so while Dazai was fighting an entirely different battle.