Hard to know with what Yuta thinks, he just seems to be going along with everything that's happening. Doesn't care about the other heroes, doesn't even seem to want revenge, is helping the demons because of his loyalty to Melia, and will probably attack the empire. Does he even consider the demons good, does he consider the whole empire his enemy or just the heroes, we don't really now his rationale behind everything other than, I like Melia so her enemies are mine.