At a certain prison under the surface, the "bottom of the bottom" that is the Teiai Underground Labor Facility, there is a man who uses his "one-day outing passes" to go above ground and enjoy all the luxuries of life while living in the poor conditions of the underground. His name is Ootsuki, and he is the leader of Squad E and a master of enjoying himself all day long with eating, drinking, and having a great time.