This anime is really good, the ambiance is great, we can see a character who's not the typical "heros" with allies so much different from what we can usually see in anime these day.
i've seen some guys saying its another "SAO copy" well, since SAO is a copy of Dot hack, i mean, literraly, there is no problem if overlord is something a little bit different, its true that the anime use the MMO base for his story but we change that after two episode.
I wont spoil, but its really different from what we can see, i think its more like "Tate no yuusha no nariagari" "Rising of the shield heroes", if you dont know that, you should check, its fun and really impressive too :)
