In this chapter, we're told that the evil spirits are red, and that Hiroki is able to finish them off in a second. We're also told that this is the first time we've heard of the idea of the "miasma" , which is a term used to describe the power imbalance between the physical world and the mental world . We learn that the "advanced soul rumble" . This is a reference to the fact that evil spirits can't be defeated by humans, because they're too strong . In other words, evil spirits don't have the power to defeat humans.