When Takeru Amato moves into a new apartment in Akihabara, he discovers an unexpected issue—a hole in the floor leading to the realm of the zodiac gods. Meeting Nyaa-tan, a quirky cat vying to enter the Chinese zodiac with the Eto-shin girls, he becomes a key ally in her quest. In this world, Eto-musume draw power from human emotions to transform and engage in energetic battles. As the ETM12 selection festival approaches, Nyaa-tan must swiftly win Takeru's favor to outshine rivals and claim her rightful place among the zodiac elites.