After a fall into the terrifying basement of his house, Jiji finds himself possessed by the evil eye, the avenging spirit of a little boy once sacrificed to the God- serpent by the fanatics of the Kitô clan. While Okarun remains to face him, Momo manages to rise to the surface. A clever idea comes to him in order to attract the giant snake to the outside, but even admitting that his plan works, will she succeed in defeating him and helping his friends?!