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? Utsutsu is pondering ways to help her sister, Hikari, conquer her phobia of humans and leave her closet. She turns to Mu for advice, but his answer is the last thing Utsutsu expected. Then, the usually spirited Mu takes an unexpected turn for the morose. Kori tries everything she can think of but can't restore his usual energetic nature. Who will help uncover the root of his malady?