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...
I wasn't wrong! The results of
my research were legitimate!
!لم أكن مخطئًا! نتيجة بحثي كان حقيقيّة
Ich bin nicht im Unrecht! Die Ergebnisse
meiner Forschungen sind korrekt!
¡No me equivoqué! ¡Los 
resultados eran correctos!
¡No me equivoqué!
¡Los resultados eran correctos!
Je ne me suis pas trompé !
Mes résultats étaient fondés !
Io non ho sbagliato.
I risultati della ricerca erano corretti!
Eu não estava errado! Os resultados
da minha pesquisa eram legítimos!