Mana and Cat-girl visit a certain island known as a tourist spot. At the same time, Ratman arrives on the same island with the production crew of a TV show about bizarre and scary stories and the talent starring in the show. There is a legend on this island of a terrifying yokai called Gyuuki, but the talent doesn't believe in old stories like that, and moves the stone where Gyuuki was sealed, releasing him. The is suddenly beset with pain, and transforms into Gyuuki even as they watch. He lays waste to the town in his struggles and eats Ratman. Cat-girl and the others are in danger. Kitaro appears and confronts Gyuuki. Then, when it seems that Kitaro has completely defeated Gyuuki...!
The Gyuki's true form is
a gas that alters living cells.
شكل غيوكي الحقيقي هو غاز
.يغيّر الخلايا الحيّة
Gyūkis wahre Gestalt ist die eines Gases,
das die Zellen verändert.
Su verdadera forma es un gas 
que altera las células vivas.
Sa véritable forme est un gaz vivant
qui altère les cellules.
Gyūki è in sostanza 
un corpo gassoso vivente che altera le cellule.
A verdadeira forma do Gyuki é
um gás que altera células vivas.
Настоящая форма Гьюки — газ, 
меняющий живые клетки.