Momo Ayase, a high school girl who believes in ghosts but not aliens, meets Ken Takakura, a classmate who believes in aliens but not ghosts. To prove each other wrong, they visit haunted and UFO-related locations — only to discover that both the supernatural and extraterrestrial are real.

From that moment on, their lives spiral into chaos as they fight bizarre enemies, uncover hidden powers, and form a strange but heartwarming bond.