Light Novel Volume 7

The strongest dull prince's battle for the throne 7, The SS rank prince who acts incompetent will control the succession war from the shadows (最強出涸らし皇子の暗躍帝位争い 7　無能を演じるSSランク皇子は皇位継承戦を影から支配する lit. Saikyō degarashi ōji no an'yaku teii arasoi 7 munō o enjiru SS ranku ōji wa kōi keishō-sen o kage kara shihai suru) is the seventh light novel of the series and will be published on July 1, 2021.

Summary
The next secret maneuver――Dispel the darkness approaching Saint Leticia

Grimoire, the criminal organization moving in the darkness of the commemorative ceremony. As Al and Leo move separately to suppress those who aim for Saint Leticia, however what awaits them is an even larger scheme which swallows up the entire Imperial Capital