Nice, first review. Going to make it short since like 3 people will see this.
Story (7/10): A zero to hero story with a small twist. Nothing fantastic, but definitely gets the job done.
Art (8/10): The art style reminds me of what other mangas of a similar type are trying to do, just done much better. Its not fantastic, but is has very nice stills occasionally.
Character (8/10): Character approaches situations reasonably, which makes it much easier to read without being annoyed. Also, the protagonist manages to be a genuinely good guy, but without going out of his way to help everyone and everything (he has his priorities straight).
Enjoyment (9/10): Just very fun to read.
Overall (8/10)