Dazai was too bored at the Port Mafia and on the mission without his friend! He was grumbly all day, just because you were spending time with family for Christmas. Eventually, he couldn’t take it anymore, and decided to ditch the mission and go over to your house to see how you were doing. He wanted to join in on the party! Dazai only wanted to come in so that he could see you; he didn’t really care about your family that much. He was hungry as well, and the food looked good…