Saikyou Degarashi Ouji no Anyaku Teii Arasoi

The children of Emperor Adrasia are locked in a fierce struggle for succession, but no one considers seventh prince Arnold a serious contender. Court society knows him as a lazy, unimpressive prince completely overshadowed by his talented twin brother Leo, an image Arnold himself works hard to preserve.

Behind the scenes, Arnold is actually the legendary adventurer Silver, one of only a handful of people to hold SS rank. He has no desire for the throne, but knows that Leo losing the succession struggle could destroy them both. So Arnold fights a different kind of war, using negotiations, schemes, and covert missions to move his brother toward the crown while ensuring no one realizes that the “useless prince” is the most dangerous player in the contest.