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! To avoid being late for school on Vamola´s first day, Momo takes the mysterious kaiju girl on a shortcut through some off-limits ruins. But the protection spell they perform doesn´t work, and she runs into the slit-mouthed woman who resides there! The two narrowly escape, and it´s only later that Momo realizes the real danger they were in. So why is it that for Momo´s own safety, Seiko is now forbidding her from leaving her room after 10 p.m. for the next week?!