Vampiric incidents have been frequently occurring on the streets. While Kitarō was investigating, he receives a letter. The sender wanted to be killed. Kitarō visits Onozaki, the sender of the letter and a researcher of genetic manipulation. Onozaki had created an immortal cell, and experimented with his own body. The result: he was mutated into a yōkai and gained an immortal body. When he mutates into the yōkai, he becomes a monster that desires blood. The vampiric incidents were all caused by Onozaki himself. Onozaki, who cannot commit suicide due to the immortal cell, asks Kitarō to kill him, however...
