Hieda-sensei is a professor of archeology, with a fervent belief in the existence and power of supernatural creatures like gods and demons. Since he can't prove anything, his belief has earned him the mocking nickname "Youkai Hunter" from his colleagues. One day, two men from Ootori-chou come to visit him. They're planning to promote tourism by reviving their town's old, traditional "Demon Festival," which has been discontinued for the past century. They're basing the festival on Hieda's research, although they're changing a few details to make it flashier for modern sightseers. Although Hieda is troubled by the history of human death associated with the festival, he agrees to attend as an advisor. When the Demon Festival turns out to be much more 'historically accurate' than anyone ever dreamed, it will take all of Hieda's knowledge and courage to help set things right! 
(Source: MangaHelpers)

A former professor of archaeology, Hieda Reijiro, was expelled from the Japanese Archaeological Association for claiming that youkai exist. 
Ancient horrors come to life before our eyes as the youkai hunter wanders the land to find proof for his theories. 

This is a 1978 compilation which includes the previously published Morohoshi stories published between 1974 and 1976, they are collected in the following order: 
1. The Black Investigator [ 黒い探究者 ]; Weekly Shonen Jump #37 (1974) 
2. Red Lips [ 赤い唇 ]; Weekly Shonen Jump #38 (1974) 
3. The Tree of Life [ 生命の木 ]; Weekly Shonen Jump Special August Issue (1976) 
4. The Masked Face in the Dark [ 闇の中の仮面の顔 ]; New story realized purposely for 1978's Yokai Hunter tankobon edition 
5. The Living City [ 生物都市 ]; Weekly Shonen Jump #31 (1974)

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