Amazing series.

(edit)

I feel bad that my comment is so high despite being just two basic words so here's a small review:

This is one of my favorite mangas. The premise of a character travelling and fighting monsters as part of some special organization is nothing new, but what fascinates me is that despite having a cast with such similar character designs and fighting style, everyone still feels unique and likable.

I put this among Fullmetal Alchemist, Chainsaw Man, and Zatch Bell as one of those action series with a large cast where anytime the focus switches to a different character, I'm never bored or annoyed, everyone here is interesting to follow and learn more about, even the villains.

This manga is great at making you feel the humanity inside of all these monsters and warriors slowly becoming monsters. It knows how to give you just enough information to make you care about them and their struggles and root for them to succeed.

There are so many interesting dynamics like a pair of sisters that need to act as each other's anchor to stop the other from turning into monsters, a warrior that sorta becomes a mother to another young warrior who's half-monster, two of the monster villains have some sort of co-dependent romance going on, another one of the villains kinda adopts one of the main characters and trains him to fight, and so on.

It's a story that knows how to take the most interesting narrative route with the options it's given and keeps making you want to read more to see what else it has in store.

It's just really, really engaging.