This anime carefully crafts a complex and varied universe without leaving any doubt about its inner workings - it's an accomplishment that not many media can claim to have achieved.
And, in this amazing universe, an equivalently well-thought-out story is told: rich of dark social themes, interesting characters, romance, action, sci-fi/fantasy/mystery elements, and more.
And again, everything just "makes sense". The level of immersion this anime has on the viewer is unbelievable.
There hasn't been a single moment where I questioned the logic of something happening during the series - all events, dialogues, locations, phenomenons, mechanics, and characters were extremely believable and presented in such a way that the viewer felt they were real.
Overall, this anime is close to perfection for me.
