Suzunari!

Kaede Takamura's life takes an unexpected turn when she encounters what appears to be her twin. This girl, Suzu, looks nearly identical to her but has cat ears, a tail, and a more developed physique than Kaede considers typical for a teenager. Despite her unusual traits, Suzu is welcomed into the Takamura household. Unfamiliar with modern life, Suzu's presence creates challenges for Kaede, who must navigate the difficulties of having a feline-like sibling with no knowledge of contemporary society.