At around the half-way point of the game, you find out that the protagonist (Kalas) has been working with the game's villain since the very beginning. You don't actually play as the protagonist in this game, but as the Guardian Spirit who lives inside Kalas. But you are so intrinsically connected to him in the game that there might not be any distinction at all... until this point. Kalas is actually his own character with his own motivations, he's not driven by you, the player. You are just his Guardian Spirit, and that's really driven home at this point.
At this point he even removes you (the Guardian Spirit) from himself. Your party members are scattered. You switch protagonist for a while. Pretty cool!