Light Novel Volume 4

The strongest dull prince's battle for the throne, The SS rank prince who acts incompetent will control the succession war from the shadows 4(最強出涸らし皇子の暗躍帝位争い　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 4lit. Saikyō degarashi ōji no an'yaku teii arasoi munō o enjiru SS ranku ōji wa kōi keishō-sen o kage kara shihai suru 4) is the fourth light novel of the series and was published on August 1, 2020.

Summary
The twin princes have successfully stopped the disaster occurring in the southern part of the empire. As smoke from embers of the conflict spread, an information war between the three powers begins――!