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They're not cats, they came from outer space!
Humans can’t see them. They resemble cats, but they aren’t cats. A somewhat mysterious group of friends, they are the Nyanbo! A spin-off from author Kiyohiko Azuma’s Yotsuba&! manga, Nyanbo! follows Tora, his sister Kotora, and their friends Shiro, Kuro and Mike as they inhabit our world while they reassemble their UFO to return home.