honestly the summary made this sound about 10x better than it actually is. The main problem is that the author can't seem to decide what he wants the main character's personality to be.
And honestly, it seems like the author also can't decide on which plot to focus on. For example, what just happened in ch 6, it felt like just a random ass event thrown at the MC just so that he'll have something to do before the more interesting events happen. Basically "save a heroine" event. It's even stupider because the main character randomly teleports like Jason Vorhees to their location and acts all mad, but it's really cringe. Like my brother, you're tens of thousands of years old at this point, how do you still have the emotional maturity of a teenage boy? Coming in while screaming in rage and shit. It's cool when a young man or teenager does it in manga, like Guts or any random action shounen protagonist, but when I think about the fact that he's old enough to be my messiah, it becomes pretty damn cringe. My total rating is bleh/10.