A nerd must fight powerful spirits and aliens all vying for the secret power of his "family jewel," so who better to fight alongside him than his high school crush and a spirit granny?! Momo Ayase and Okarun are on opposite sides of the paranormal spectrum regarding what they'll believe in and what they won't. Their quest to prove each other wrong leads them down a path of secret crushes and paranormal battles they'll have to participate in to believe! The diorama board game that Momo and Zuma have cleared to secure their release has turned out to be a cursed wicker trunk imprisoning an evil yokai called the Fairy-Tale Card. The yokai quickly possesses Zuma and draws 'Brella Boy's power out to its fullest, causing 'Brella Boy to attack Okarun and the others. Momo gets seriously injured. Just as all seems lost, Rokuro appears on the scene! And with the police?!.