I really liked this anime, rather than building up to a extreme level of power, the MC was powerful off the bat and did continue to improve. I'm curently up to episode 10, and the only negative I can pinpoint is the relationship between Shin and sizilien. I understand they do only have tweleve episodes to build a relationship however they went from tip toeing around their feelings to confessing, dating and getting engaged all in one episode. Since there is so few episodes, I think they should have cut any serious romances like that and maybe just kept it flirtatous or subtle, or even a "1 year later" scene to clarify that they did get engaged/married.
Would have liked a bit more focus on action. Art was fantastic.