A one-shot included in Morohoshi Daijirou "Youkai Hunter" Ikai e no Tabi (Taiyou no Chizujou magazine volume 31).

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 the first serialization of Youkai Hunter with one additional chapter, which were all collected in the first volume in 1978. 
1. Kuroi Tankyuusha (黒い探究者) [Weekly Shounen Jump #37 (1974)] 
2. Akai Kuchibiru (赤い唇) [Weekly Shounen Jump #38 (1974)] 
3. Seimei no Ki (生命の木) [Weekly Shounen Jump Special August Issue (1976)] 
4. Yami no Naka no Kamen no Kao (闇の中の仮面の顔) [new chapter made specifically for 1978's Youkai Hunter tankoubon edition] 
5. Seibutsu Toshi (生物都市) [Weekly Shounen Jump #31 (1974)]

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