I remember that in one arch the mc went to a Stone Age like world and pretended to loose his memory so he could get the ml who was the older brother the original owner of the body was gonna dump. The ml could also transform into some kind of white wolf. There was also another person who was reborn in the tribe and they were both competing to see who would be chosen by the best god. In another sentinel x guide arc, the Ml was a sentinel who manifested a wolf that was the same as the ml in Stone Age arc used to transform into. I forgot the title and really want to read it again
I think it is the Pineapple Arc of this novel: https://www.novelupdates.com/series/discussing-the-correct-posture-to-enjoy-dog-food/ Or this link: https://www.mtlnovel.com/discussing-the-correct-posture-to-enjoy-dog-food/