When Mana visits GeGeGe Forest, she finds Kitaro and Ratman arguing over something trivial. They each declare for the I-don't-know-how-many-th time that they're cutting ties with each other. Meanwhile, in town, the water has been contaminated sending everyone running around looking for drinking water. No one knows why the water is polluted, and no attempts at purifying it work. Kitaro believes that the one behind the pollution incident is one of the Four Generals of Betrayal. Kitaro begins an investigation, but doesn't know how to stop the pollution of the water. Meanwhile, a survivor of the Way of the Demon Society, Isurugi Rei, begins to move again...!?
Ironic that a yokai that pollutes water
is weak against it!
من المثير للسخرية أنّ يوكاي
!يلوّث الماء ضعيف ضده
Wie ironisch, dass ein Yōkai,
der Wasser verschmutzt, kein Wasser abkann.
Es irónico que un yokai que contamina
el agua sea débil a ella.
Es irónico que un yokai que contamina
el agua sea débil a ella.
L’ironie du sort. Tu la pollues,
mais tu ne lui résistes pas !
Che ironia che uno yōkai che inquina l'acqua 
soffra l'acqua stessa!
É irônico que um yokai que polua
a água seja fraco contra ela!
Какая ирония: ёкай, который 
загрязняет воду, боится воды!