In town, blood-sucking incidents are growing frequent. As Kitaro investigates, he receives a letter. The sender wants to be killed. Kitaro goes to visit the sender and meets Onozaki, a genetics researcher. Onozaki has created immortal cells and conducted an experiment where he injected himself with them. As a result, he has obtained an immortal body and also turned into a youkai. When he transformed into a youkai, he lost control and went seeking blood. All the recent blood-sucking incidents were Onozaki's doing. Because of the immortal cells, Onozaki can't kill himself, so he begs Kitaro to kill him, but...
Because of my human experimentation,
I became the yokai, Odoro-Odoro.
،بسبب تجربتي على نفسي
.أصبحت اليوكاي أودورو-أودورو
Durch mein menschliches Experiment
wurde ich zu einem Yōkai, zu Odoro-Odoro.
Mis experimentos me convirtieron 
en el yokai Odoro-Odoro.
Mis experimentos me convirtieron
en el yokai Odoro-Odoro.
Mon expérience m’a transformé
en Odoro-odoro, un esprit.
Come punizione per i miei esperimenti sul corpo umano,
 sono diventato lo yōkai Odoro Odoro.
Por causa de experimentos humanos,
virei o Yokai, Odoro-Odoro.
Я экспериментировал на себе — 
и поплатился, стал ёкаем Одоро-одоро.