Atsushi's far-fetched idea to form an alliance with the Mafia results in a summit between crime boss Ougai Mori and Armed Detective Agency president, Yukichi Fukuzawa. However, when negotiations fail, Dazai has no choice but to infiltrate enemy territory alone in order to secure Q. There, Dazai runs into some unexpected trouble ... until a familiar man appears before him ...!

"First published in Japan in 2015 by KADAKOWA CORPORATION, Tokyo."--Colophon. Reads right to left.