Origin is not a very good manga. The characters are not very well developed (or maybe that's due to there only being 38 chapters) except for maybe Origin. The story itself isn't amazing either, often only reaching mediocre, and is mostly cheese. The art is good, but nothing exceptional. So why do I rate this series a 7?

Because I found it to be an extremely fun read

While Origin lacks in story and characters, it makes up somewhat with the action. The action is on a level I haven't experienced much in the world of manga. "Turning pages" ruins the flow for me, but not for Origin. Origin has induced in me a state of childish glee. The action and story, while cheesy, are extremely enjoyable for me.

Origin is not a particularly good manga, however, the protagonist is a ROBOT NINJA. How could you not try it out?