The day before he begins attending high school, Ashiya Hanae becomes possessed by a strange fuzzy yokai. Being possessed causes him to fall ill, and while spending the start of his high school life repeatedly making trips to the nurse's office, he comes across the contact information of the Mononokean, which specializes in exorcising yokai, and decides to call them. When Ashiya finally visits the Mononokean, he meets the morose master Abeno Haruitsuki.
I'm going to die today if 
this thing sticks around!
Mit diesem Ding an der Backe
werde ich noch heute das Zeitliche segnen!
¡Esta cosa me matará
si se queda otro día conmigo!
Je vais mourir ce soir,
avec un monstre pareil !
Vou morrer se essa coisa
 continuar por perto!