Aboard the Sky Casino, Sigma of the "Decay of Angels" confronts Teruko of the Hunting Dogs! Lacking a combat-oriented Ability, Sigma uses every means at his disposal to back Teruko into a corner. Inside Anne's room, Atsushi and his friends are searching for a chance to counterattack. Meanwhile, as Tachihara continues to search the interior of the Sky Casino for evidence of terrorist activity, a certain piece of evidence comes to light...?! The tactics of Dazai and Dostoyevsky set off fireworks across their chessboard in the sky! Agents on the run, authorities in pursuit, an ordinary man with no combat Ability - desperate times call for desperate measures!