This series is one of my favorites as it places a new perspective on defining "evil." The setting itself is unique, not only did the game world take over the original world, there was even a time skip of hundreds of years. I was blown away that much time passed, usually, it would be very difficult to work with a story of such a large gap. Even more impressive, the main characters treat the game like a game, dying in the game comes with a typical revive, and so on. What pulled me was revealing a new perspective of being evil. What can appear to be good for the peoplecan be evil if it's forceful and ignorant.
Evil could be good IF it embraces logical fair reasons to act out against the good.

It's sort of difficult to explain it in words, so I urge new readers to read for at least 25-30 chapters to get a feel for what I mean.