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
The Insipid Prince's Furtive Grab for the Throne
Saikyou Degarashi Ouji no Anyaku Teii Arasoi: Munou wo Enjiru SS Rank Ouji wa Koui Keishou-sen wo Kage kara Shihai suru
Action · Comedy · Drama · Fantasy · Romance
To the empire, Prince Arnold is one big joke, a completely inept prince outshone by his more talented twin, Leonard. But in secret, Arnold operates as Silver, one of only five magic-wielding SS-rank adventurers on the continent. As the bloody battle for the throne intensifies after the crown...
Synopsis excerpt via AniList, originally from Crunchyroll.