Comments for Bleach 4
Bleach 4 further explains what Hollows are and how they are created. Ichigo and a popular TV psychic learn the hard way the danger of doing haphazard spiritual cleansing.
A mystery also begins near the end of the volume. Someone other than Ichigo and Rukia are taking care of the hollows. Either that or her detector has started to misfire. The who behind the mystery is shown on cover but the how and the why is revealed in volume 5.
Overall I like how each new volume brings something new to the overall story arc. Each one reveals more information either on characters or on how the world works. Volume 4 does both, bringing in more pivotal characters and better explanation to how the spirit world works.