On a cool summer evening in 1977, Mayumi Inaba hears a forlorn cry. She follows the sound to the banks of Tokyo’s Tamagawa River and finds a newborn kitten dangling from a fence, abandoned. Overcome by tender affection, she takes the cat back to the small apartment she shares with her husband and christens her Mii: so begins an unshakeable bond.

Over the next twenty years, we follow Inaba, a poet and novelist by moonlight, as she pursues quiet solitude and a room of her own. Through it all, Mii, a fiercely independent creature in her own right, is her confidante and muse.