The manga also inspired four previous OADs that shipped with the 17th, 18th, 19th, and 24th volumes of the manga.
The limited edition of the 29th manga volume will ship on September 20 with the OAD.
The September 20 OAD will include two episodes. The Ryūgūjō (Dragon Palace Castle) members make their anime debut in the first episode, “Enmachō to Ryūgūjō.”
Then the familiar members of Hell enjoy some karaoke in the second episode, “Jūhachi-ban ga Nai to Tsurai Are.”