The anime is amazing the character development is great, Thestory is decent as well and the supporting characters are good too, but the most irritating thing is that the protagonist is considered both the strongest as well as the weakest character throughout the series, he accomplishes feats that no one can fathom and yet he is not respected by anyone, to the extent that he has been given the nickname Masochist Zombie. Which is the worst thing about the series. So even though it is a great anime, Just because of this recurring plot device used throughout the series, I cannot bear to even think about the series, let alone rewatch it, and I rewatch any anime that I watch at least 5 times.