Okay, I used to follow the manga when it first came. So I kinda knew some of the story but I wasn't expecting an anime coming out from it. Anyway, this episode actually followed the manga on the exact events and introduces what is going on here. The characters are okay and the setting is not bad just like the manga. But, the down side is that I don't like the protagonist being "fat" but then again, I guess the creators did it to make him unique in the series. Overall, not much to say besides so far so good.
Conclusion: Intro is not bad and is just like in the manga.