As a professional police officer, this world's own self is simply a scholar!,While relying on the fact that he gained memories directly after crossing over, another version of himself should also be able to gain his memories. That way, being a translator and making life easier would certainly be enough.,Besides, I wonder if you've seen Monogatari Series, where Araragi Kun became a deputy police superintendent at 23 after graduating from university. His sister joined the police force as a patrol officer while still in high school.。