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...
You idiot! It's okay to drink the blood
of people who want to die?
حمقاء! ألا بأس بأن يشرب
دماء الناس الذين يريدون الموت؟
Du Närrin! Du meinst, es wäre in Ordnung,
solange sich die Leute umbringen wollen?
¡No seas boba! ¿Está bien beber la 
sangre de alguien que quiere suicidarse?
¡No seas boba! ¿Está bien beber la
sangre de alguien que quiere suicidarse?
Inconsciente !
Tu trouves ça sensé ?
Stupida!
Idiota! Acha que tudo bem em
beber o sangue dos outros assim?
Дурёха! Пить кровь людей, 
желающих умереть — это нормально?