I'm going to guess how the story goes from here.
MC successfully kills the traitors. Prince Eligion turns out to be a scumbag who wants to genocide all the other races or whatever. Also, he killed Ageha or has her in his evil sex/torture dungeon. Also, the demon lord is actually a good guy trying to stop the prince's plan.
MC decides to reset and side with the traitors this time. Shenanigans ensue as MC tries and fails repeatedly to convince the traitors that he's on their side. Eventually, he succeeds.
They team up and kill the evil Prince. The MC gets logged as a traitor to humanity, because the prince's father starts spreading propaganda against him while sending assassins after him.
Plot twist: the MC turns out to be the silver-haired guy who made everyone racist against silver-haired people 100 years later.