A new home filled with the ghosts of Shiba Inu. What could go wrong?

When high schooler Kori Momose goes apartment hunting to be closer to her new school, she comes across a one-bedroom unit at a shockingly cheap price. What's the catch? The ghost of a Shiba Inu dog named Mu is bound to the apartment! But for a girl as icy and awkward as Kori, is sharing a life with the fiery Mu too tall an order?

Mu flies into a ghostly panic when a sheet falls from the upper-floor balcony. Knowing that the apartment above hers is occupied by a strange woman who always wears a dog mask, Kori nervously reaches for her neighbor's intercom button. Who lurks behind the mask...?