Light Novel Volume 2

The strongest dull prince's battle for the throne, The SS rank prince who acts incompetent will control the succession war from the shadows 2(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 2lit. Saikyō degarashi ōji no an'yaku teii arasoi munō o enjiru SS ranku ōji wa kōi keishō-sen o kage kara shihai suru 1) is the second light novel of the series and was published on January 1, 2020.

Summary
The prince who acts incompetent while concealing extraordinary talent and the power of an SS-rank adventurer, Arnold thwarted a plot aimed at harming the empire. But, due to the Emperor's jest he was to accompany his twin brother, Leo as an representative to another country. Furthermore, due to an attack by a 'Sea dragon' in the middle of the journey, both were separated from the other, with both having swapped places!?

By playing the part Leo without error, Al was ready to maneuver in the shadows even overseas, But the awakened 'Sea Dragon' started attacking people ―― "The pride of a dragon, huh? stupid drivel. Don't underestimate humans". The incompetent prince who hides his talons, along with Elna who summoned the Holy sword completely suppress the 'Sea Dragon' and controls the diplomacy.