This is perhaps the most original, trippiest, creepiest, and imaginative thing I've ever read.

The world is very well thought-out. It is primarily divided into the Hole, a place populated by humans, and the Magic Users' world, populated by human-looking beings with extraordinar[ily weird] abilities. These abilities range from your standard healers, to devastating mushroom attacks, and everything in between. The humans and the magic users don't like each other.

The plot is a lot harder to describe. I mean, saying "well it's about an amnesiac guy with a lizard head named Kaiman who wants his real face back so he's biting people faces so that the guy inside his mouth can identify the person who may have did this to him" doesn't really cut it. There's A LOT more to it than that, but you have no idea what's going on until volume 7+, when it gets much darker and the real story of Kaiman's memories and identity starts coming together.

That's okay, though, because the series is very entertaining throughout with its hyperviolence and dark humor, and you really do need such a long introduction to get used to this world and its, err, "colorful" cast of characters. That's not to say that the first few volumes are irrelevant for plot progression. Pieces of the plot are sprinkled everywhere but you might not realize it at first. To fully appreciate this it's best to go back once you know all that you will later on, which makes for a lot of re-read value!

/Where else can you find the phrase "The Boss is no longer a pie!!"? XD