Interesting.
This world is a game.
The first prince, who may or may not be the protagonist of the game is a reincarnated person who played the game previously.
But there’s a second reincarnated person who knows this is a game, but seems less aware of details than the first prince (we know there’s a second person because they pointed out the prince and his group).
But there’s a second MC of the manga seems to be a regular NPC of the game (at least no mention of reincarnation, yet) and they have powers, at least the ability to communicate with elemental beings.