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...
At first I only became the Odoro-Odoro
and drank blood maybe once a month.
كنت أصبح أودورو-أودورو وأشرب
.الدماء مرة في الشهر في بادئ الأمر
Zuerst wurde ich nur etwa einmal im Monat
zu Odoro-Odoro und trank Blut.
Al principio solo me transformaba una 
vez al mes y salía a beber sangre.
Al principio solo me transformaba
una vez al mes y salía a beber sangre.
Au début, ça ne se produisait
qu’une seule fois par mois.
All'inizio me la cavavo diventando Odoro Odoro 
e succhiando sangue circa solo una volta al mese.
Da primeira vez, só me tornava Odoro-Odoro
e bebia o sangue uma vez por mês.
Сперва я становился Одоро-одоро 
и пил кровь всего лишь раз в месяц.