Momo and Okarun arguing about whether ghosts or aliens are real, then immediately having to fight both, is the entire show's DNA. The animation doesn't just move fast, it moves with joy, every frame designed to make you feel the exact energy the characters feel. This is a series that knows spectacle isn't a substitute for genuine chemistry between two people who drive each other insane, and it never stops moving long enough for you to care that the plot barely exists.
Momo dismisses aliens as fantasy while Okarun insists ghosts are pure fiction. When a heated argument between the high school classmates reaches a breaking point, they make a reckless wager: each will venture into a location tied to what the other believes in. If Momo survives a UFO sighting at an abandoned hospital and Okarun makes it through a haunted tunnel alive, they'll finally settle who's right. Neither expects what actually waits for them. Momo's family background as spirit mediums suddenly matters when she encounters something far more dangerous than folklore. Okarun discovers he's capable of channeling supernatural forces he never knew existed. Forced together by circumstances neither could have predicted, they realize the world is far stranger and more threatening than their argument suggested. As they grapple with powers awakening inside them and dangers multiplying around them, an unexpected connection forms between the two. What starts as stubborn pride transforms into something neither saw coming, all while they struggle to survive encounters that defy everything they thought they understood about reality.