While on a mission, Atsushi and Akutagawa get hit by an ability that turns them into babies, and Dazai and Chuuya are put in charge of watching them and caring for them. Dazai gets progressively more jealous as Chuuya starts to ignore him and only pays attention to the two babies. Dazai attempts to try and get Chuuya's attention, but it almost seems like the two babies are working against him in a way. At the end, he is mostly just clingy and desperate for attention from Chuuya and he gets teased for it.