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'm begging you, Kitaro-san.
Please kill me!
!أرجوك يا كيتارو-سان. اقتلني من فضلك
Aber ich flehe dich an, Kitarō!
Bitte töte mich!
Por favor, Kitaro-san, mátame.
Por favor, Kitaro-san, mátame.
mais je vous en supplie,
Kitarô, tuez-moi !
Ma la prego, signor Kitarō.
Mi uccida, per favore!
Eu imploro, Kitaro! Me mate!
Но прошу вас, Китаро. 
Убейте меня!