A drunk cat that sings. Three of them. An old man in an alley who somehow trained them that way, and a stranger who stumbles into the whole absurd miracle on a winter night. The OVA doesn't explain itself, it just lets you sit in something genuinely strange and genuinely warm at once. The music is the real character here, not decoration. By the end you're not sure if you watched a story or just remembered a dream you had about kindness.
During the winter holidays, a young man runs into a drunken cat in an alleyway, and the cat turns out to belong to an old man. Later, at a restaurant, he discovers that the old man has taught his three cats to sing. Impressed, the young man learns how the singing cats came to be, and together with the cats they enjoy a stretch of popularity. The single OVA mixes fantasy with music.