After facing an aggressive rejection, Momo Ayase is left sulking when she comes across a boy being bullied. Rescued by her impulsive kindness, the boy, who is obsessed with the occult, tries to talk to her about supernatural interests he thinks they have in common. Dismissing his claims, Ayase declares that she believes in ghosts instead, sparking an argument between them over which phenomenon is real. To settle who is right, the two make a bet to separately visit sites linked to both the occult and the supernatural—Ayase going to the former and the boy to the latter. Upon arriving at their respective locations, it becomes clear that neither was mistaken and that both the occult and ghosts truly exist. This event kicks off Ayase and the boy's adventure, as they strive to resolve the surreal, supernatural, and occult occurrences around them in order to return to a normal life.