Ousama Ranking: Treasure Chest of Courage

Ousama Ranking: Treasure Chest of Courage (王様ランキング 勇気の宝箱, Ōsama Rankingu: Yūki no Takarabako) is an upcoming Japanese anime special based on the manga of the same name by Sousuke Tooka. It's billed as a special episode of the Ousama Ranking anime, depicting a new adventure with Bojji and Kage.

The special was announced on August 8, 2022 via the official Ousama Ranking anime twitter, and is scheduled to air on Fuji TV's Noitamina programming block in April 2023.

Plot
"A treasure chest of unspoken courage is opened."

A teaser trailer, released December 4, 2022, shows new footage from the special interspersed with footage from the series. Though intentionally obscure with actual plot details, the teaser shows the following:

The tagline for the special appears to be, "I'm sure you'll find it."
 * Bojji undergoing some kind of rapier training.
 * Hilling and Anne having an adventure together.
 * A flashback to Desha's revolution in the Underworld (which appears to be adapted from the Volume 9 bonus chapter, "Immortality")
 * Bojji traveling with a mysterious figure in gold and blue plate armor.

Staff

 * Director: Yousuke Hatta
 * Series Composition: Taku Kishimoto
 * Character Design: Atsuko Nozaki
 * Music: Mayuko
 * Animation Work: WIT Studio

Cast

 * Minami Hinata as Bojji
 * Ayumu Murase as Kage
 * Yuuki Kaji as Daida
 * Rina Satou as Hilling
 * Takuya Eguchi as Domas
 * Youji Ueda as Bebin
 * Hiroki Yasumoto as Apeas
 * Hinata Tadokoro as Dorshe
 * Daiki Yamashita as Hokuro
 * Takahiro Sakurai as Despa