Yuuko Konagai, an ordinary high school student with poor grades and few friends, finds solace at home with her three cats Maa, Shi, and Ro. These feline companions, with human-like bodies and the gift of speech, eagerly await Yuuko's return each day, offering her the comfort and friendship she craves. Nyanko Days follows Yuuko's heartwarming journey as she bonds with her extraordinary cats and discovers new friendships along the way.