Falling from the Sky Casino, Sigma is saved by a most unexpected ally who was thought to be dead - and who then urges Sigma to help him "kill" Dostoyevsky, his dear friend.
Meanwhile, Kunikida and the others beging to vanish one by one at the hands of Kamui, a member of "The Decay of Angels".
But so long as the Armed Detective Agency has "that man", they are sure to rise again no matter how dire the odds.
There is no right without a dawning... The signal flares of the Armed Detective Agency's resurrection now rise!