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...
In order to prove it, I've decided to
use myself as a test subject.
من أجل إثبات ذلك، قررت استخدام
.نفسي كعينة تجربة
Um das zu beweisen, habe ich beschlossen,
selbst als Versuchsobjekt herzuhalten.
Decidí experimentar en mí 
mismo para demostrarlo.
Decidí experimentar
en mí mismo para demostrarlo.
Pour le prouver,
Per dimostrarlo,
 ho deciso di provare su me stesso.
Para provar, eu decidi
me usar como cobaia.
Чтобы это доказать, я решил сам 
стать объектом тестирования.