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! Okarun, a high school boy obsessed with supernatural phenomena, is cursed by Turbo Granny! Along with his classmate Momo Ayase, he challenges Turbo Granny to a game of tag as a means to lift the curse. If the two can stay out of her reach until the finish line, they'll win. But Turbo Granny's assassin, a bound spirit in the form of a giant crab, has other plans!.