It’s very dark manga in many ways. It’s not bloody but somehow…scary.
The story is about Susumo Nakoshi, a man who let a medical student to make a hole in his brain. After that he starts seeing metaphors of people’s personality. Take a high school girl whose afraid of what other’s think and always do what her parents want her to. In his eye, she’s a sand who looks like human. The form of sand changes as she responds to outer world.
Yup, you have to have a brain to analyze it. It’s not something you can laugh about.
Read it in mangascreener