is a Japanese anime television series produced by Encourage Films and Shirogumi, which aired from April 9 to June 25, 2015. A manga adaptation began serialization from December 2013 in ASCII Media Works's shōnen manga magazine Dengeki Daioh. A 30-minute original net animation (ONA) episode titled Etotama ~Nyan-Kyaku Banrai~ premiered on May 25, 2021.

Plot The anime's story revolves around Nya-tan, the cat of Chinese astrology who wants to become a member of the Chinese zodiac. Nya-tan is simple and suffers from memory loss, and she tries various idiotic ways to become a member. She meets Takeru Tendo, a high school student who lives alone in Akihabara, and becomes a freeloader at his house. Little by little, she gets closer to her goal.

Sol/Lull is the source of the Eto-musume's life force. Sol/Lull is the embodiment of proper human emotions, it's a type of energy only humans possess, like Takeru Amato. Every time a human feels grateful, Sol/Lull appears. And when Sol/Lull collects into an Eto-musume's soul, their Etotama, they transform from adult mode, the form that allows then to exist in the human world, to the form that allows them to fight in the Eto world, pretty mode.

Characters (sometimes stylized as Nyaa-tan)

Eto-Musume of the Cat, she's the heroine of the Etotama series. She is part of the Chinese astrology. Her goal is to become one of the twelve Zodiac Gods, and she tries various ways to become a member. She then meets Takeru Amato, a high school student who lives alone in Akihabara, and ends up living is his house and becoming a freeloader. Nya-tan is a girl that has a quite chubby and cute face. She has medium length, straight light brown hair and brown, goldish eyes. She accessorizes her hair with a big yellow ribbon at the back and a yellow star with an upside down happy face on it on the side of her hair. Her clothing consist of a collar that comes with a golden bell, a white shirt with a sailor-like blue ribbon/necktie and a slightly darker blue skirt with another huge ribbon behind it. She also wears blue and white cuffs around her wrists and brown shoes that come with knee-length blue and white stockings with flowers on the side. Like all the other Zodiac Girls, Nya-tan also has two ears - cat ears in her case, and a thin, white tail. "A natural fool with a innocent personality that does not give up." Nya-tan is a very bright and cheerful and kind girl and also quite childish, which explains why she often says jokes and plays around. She can however be shy sometimes and she is sort-of-an airhead, so Takeru has to watch over her. When she finds something she wants to do, she doesn't stop until she has reached it, and she is always straight toward the goal she is aiming for. Cat Gun (, Kyatto Gan) is Nya-tan's special attack. It's not a gun, but more like a laser with cat palm on it. It is used in the second episode, against Moo-tan. Very little is known about Nya-tan's past because she has amnesia (Episode 2), but she always wanted to be a member of the zodiac gods. Although her and Takeru's relationship has not been shown so much, it seems like they are on friendly terms, and Nya-tan called him by his first name when she first met him. She is ranked at the very bottom under her friend, Uri-tan. She must battle and get all 12 seals to become an Eto-shin. She wins Moo-tan's seal in episode 2 and Usa-tan's seal in episode 4. Mei-tan gives her seal in episode 5, while she obtains Shima-tan, Kii-tan and Inu-tan's seals in episode 6 and Shaa-tan gives her seal in episode 7. Piyo-tan gives her seal in Episode 8, but forgets afterwards.

In her battle form, Nya-tan has a white cat-hat, with green ears in it, and also a happy face on it. She also has white boots with flowers on it, instead of brown shoes. She also seems to have a thicker tail. Nya-tan's appearance in the manga is the same as in the anime.

The main protagonist of the anime, he's a normal high school student who moves to a house in Akihabara and meets Nya-tan and the Eto-Shin. With praise, he gives off "Sol/Lull" which is the life source the Zodiac need. Takeru is a young, tall high school student. He has short black hair that reaches his chin, and he has red glasses that he wears over his amethyst eyes. He wears a white shirt with black sleeves that show a tiny bit of white at the edges and two orange diamonds over-lapping each other, one lighter than the other, and four black-and-white chess-like squares at the bottom of his shirt and at the folded bit at the top. To finish it off he wears a red tie that has the black-and-white squares at the bottom. Then, he finishes the look off again with a pair of black pants and light-gray shoes. Out of all of the free-loaders, Takeru can probably be considered the only 'normal' person in here that holds common sense. Even through this, he takes everything quite nicely and doesn't seem to mind most things. He can also be considered languid by some people. Even though this, he is a quite benevolent. Also, most people would see him as a comedic 'Straight Man' with Nya-tan as his partner. Takeru and Nya-tan get along in a bit of a like-hate relationship. Sometimes, Takeru is grateful for the kind acts she does but once he figures out the hidden meaning, all of his respect immediately goes down the drain. He finds her a bit less than tolerable and always ends up with an anger vein popping out due to her actions. Out of all of the Zodiac Girls, Takeru and Uri-tan enjoy their conversations with each other, and Takeru always relies on her to explain everything that's going on, like the ETM12. He also seems to treat Uri-tan a bit like his younger sister, due to everyone making her the mascot of the Zodiac Gods and doing the same, but it is barely noticeable and he mostly treats her on the same level as everyone else. Takeru tolerates Uri-tan more than everyone else due to knowing her about as long as Nya-tan. Both Dora-tan and Takeru can tolerate each other's presence and have nothing against each other. At first, Takeru had been a little wary of her after he had nearly been hit by her attack but when he realized the plot that Nyaa-tan had created, he eventually felt more comfortable. Dora-tan had commented that he was an 'interesting human' to the other Zodiac Girls, proving that she and Takeru were on good terms.

Eto-Shin of the Rat. She is ranked at #1. She protects the Southern Kanto region. Chu-tan has long, straight, but somewhat spiky, light purple hair and sharp, dark red eyes. On her forehead, she has light purple crystals. She gives off a menacing look. Being the zodiac's rat, she has two rat-ears, and also a tail. She wears an unzipped purple racing suit, although a short scene in Episode 7 showed her in a white Kimono in one of Nya-tan's memories, and she also wears a yellow necklace. Very little is known about Chu-tan's personality, but she seems to have something against Nya-tan, as she wants to destroy the cat clan. She also seems to be calm and mature, and she also seems to be very strong, wiping out many people in the Eto world. It later revealed that she is a Eto-shin, and the strongest. When she appears in episode 3, she claims that she can not let the cat clan live. She is the most dangerous of all the Eto-shin. One of the four Eto-shin, (Her, Piyo-tan, Usa-tan, and Uma-tan) who is against the Cat joining the Zodiac. In her battle form, Chu-tan has a black rat-hat, with purple eyes, and she also has slightly shorter hair. Except that, her battle form is the same as her original look.

Eto-Shin of the Ox. She is ranked at #2. She protects the Tokai region. Moo-tan is a tall busty girl that has wavy pink hair that falls beneath her hips. She has bright pink eyes and gives off a playful air. Being the zodiac's ox; she has two elf-like ears sticking out from her hair, and she also has a piercing on one of her ears, and she also has an ox's tail. She also wears an ox/cow hat. Moo-tan is a cheerful airhead that doesn't take into account her surroundings as much as the other zodiac girls. However, she is very friendly and gentle. Despite being friendly and gentle, Moo-tan is quite perverted and hyper, but she is also quite strong and clever when it comes down to fighting, shown in episode 2. She loses her seal to the cat in episode 2. As seen in episode 4, she is considered too perverted of an Eto-shin to be included in the Nya-tan issue, having her own category. She seems to be quite attached to Nya-tan. Moo-tan always wants to cuddle with her, and Moo-tan herself said that she loves her. This, however, makes Nya-tan irritated sometimes, but they are on good and friendly terms. In her battle form, Moo-tan has a cow-hat, that has a piercing on the nose. She also has the same clothing as her original one. Moo-tan's appearance in the manga is the same as in the anime.

Eto-Shin of the Tiger. Her rank is #3. She protects the Kinki region. She has straight, braided black hair, tied with a red ribbon at the bottom which falls below her shoulders. Shima-tan also has bright red eyes. Being the zodiac's tiger, she has tiger-like clothes, tiger ears and tail. One of the 3 Eto-shin,(Her, Dora-tan, and Uri-tan), who are in favor of the Cat joining the Zodiac, seen in episode 4. At first glance, Shima-tan seems like a friendly and gentle girl (which she really is), but she is rather very playful and hyper, and quite strong, hitting Uri-tan with her hands and leaving damage (despite Uri-tan being fragile). But she is naturally calm. In her battle form, Shima-tan has a tiger-hat, that seems to have quite an angry face. Also, her shoes are 'rounder'. Besides that, her pretty mode form is like her original look.

Eto-Shin of the Rabbit. She is ranked at #4. She protects the Hokuriku region. Usa-tan has long, straight blonde hair that curls at the bottom and bright teal eyes. She has tall bunny-ears and has on a blue and golden waist coat with a golden clock that hangs off of it. Underneath she wears a type of white women's leotard and grey tights, paired with red flats. Usa-tan is a princess-type and doesn't care if the spotlight is on her or not. She also seems to have a daring side, standing up on top of Takeru's luggage with no care at all. Although this, she prefers to act and talk like a lady and is quite the genius when it comes to business. She has her own Production company. She apparently likes developing the character of the Eto-Shin. She loses to the Cat in episode 4 and gives up her seal. She works in the Maid café like the others. As seen in episode 4, she is shown on a white board in Takeru's house as one of the 4 against the Cat joining the Zodiac. In her battle form, Usa-tan has a white rabbit-hat, with a yellow ribbon on it. Her pretty mode is quite different from her original look; she has a blue, long dress with white in it. She has a yellow ribbon around her neck. Usa-tan also has knee-long white socks, with black shoes, with small, yellow ribbons on them.

Eto-Shin of the Dragon. She is ranked at #5. She protects the Tosan region. Dora-tan is a young girl with light blue hair and teal eyes. Her hair is straight and quite short, reaching up only to her chest; she has her hair tied into two ponytails, laid on her shoulders with white hair-clips at the bottom, and she wears circular glasses. She also has deer-like horns, which is seen pointing out from her head, and at her back, she have a lizards tail. Her clothing is quite similar to Uma-tan with the only difference being the colours and the pattern. Dora-tan is always seen wearing a dark blue-greenish skirt that has yellow flowers on the bottom right, tied up by a ribbon, and a green kimono underneath. She also wears light brown heels and a darker shade of brown socks.