From Shintaro Kago introduction:

"Flying Head" is a monster from legends of Southeast Asia like Thailand and Indonesia for instance. I have drawn comics and illustrations with this subjects many times. Through these four comics I tried to tell "Flying Head" stories in a SF key."

This book collects all "Day of the Flying Head" issues: #1, #2, #3, #4.
Finally the collection of the so long out of stock Kago's series.