In place of Ratman who cancelled at the last minute, Mana joins Kitaro and the others on their trip. They're headed to an inn exclusive to youkai - the Immortal Onsen. Everyone's getting the most out of the hot springs, but suddenly, the inn is wrapped in an unsettling noise. The source is underground, the riotous energy from Mt. Fuji. Appeasing it is the job of the owner of the inn, but the current proprietress, Nebutori, is so fat she can't always do her work. Mana offers to serve in her place. Mana and Kitaro go into the caves of Mt. Fuji, and a huge shadow closes in on them...!?
Sometimes you just can't be so serious
Sometimes you just have to pray
A veces no puedes ir en serio.
A veces tienes que orar.
A veces no puedes ir en serio.
A veces tienes que rezar.
Ratichon : Toshio Furukawa
Vieux poupon : Bin Shimada
Tem horas que não pode ser tão
sério e outras que só nos resta rezar
Иногда серьёзно воспринимать не 
получается, иногда приходится молиться.