Loner high schooler Yuhi Takamiya is stuck living an even lonelier school life thanks to the hopeless alien Nano and the parasitic creatures Nyorpup and Panpippi. Then second-year Momoka Saeki pulls him out of the fire, and Yuhi decides to repay her by helping found the occult research club she wants for her shut-in younger brother Hikaru. But Hikaru rejects the club outright, and the president of the Yumeneko Company begins to move.