Since ancient times, Japan has upheld the tradition of the 12 Zodiac signs. Eto-musumes (Zodiac girls) have the appearance and behaviour of the animals of the Zodiac. They are pure-hearted messengers who act as a bridge between humans and the gods. Every 60 years, the ETM 12 tournament takes place in Tokyo's Akihabara district, where aspiring girls from all over Japan gather for the chance to become the next zodiac sign.

One of those girls is Nya-tan, a cat girl who was tricked by a sneaky rodent and was not able to become a Zodiac girl. There is only one condition to become an Eto-musume: you must defeat the other 12 signs. But with strength bestowed to them from the heavens above, no one has been able to defeat them for 2000 years. And so the competition begins when Nya-tan meets Amado Takeru!

Source: crunchyroll

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Sequel: Etotama: Eto Tamashii - Nyan Kyaku Banrai