Reeling from a recent breakup, Momo Ayase, a popular high school student, shows kindness to her socially awkward classmate, Ken Takakura, by standing up to his bullies. Takakura misinterprets her intentions, believing he has found a new friend who shares his obsession with aliens and UFOs. However, Momo's own eccentric occult beliefs reside in the supernatural realm; she believes aliens do not exist. A rivalry quickly brews as each becomes determined to prove the other wrong. Despite their initial clash over opposing beliefs, Momo and Takakura form an unexpected but intimate friendship, a bond forged through a series of supernatural battles and bizarre encounters with urban legends and paranormal entities. As both develop unique superhuman abilities, they learn to compensate for each other's weaknesses, leading them to wonder if their newfound partnership may be about more than just survival.