During summer vacation, a schoolgirl named Shizuku, who longs to discover her true talents, observes an ordinary-looking cat riding by himself on the train. Intrigued, she decides to follow him. This chance encounter leads her to the mysterious Seiji, a boy who is determined to follow his dreams, and The Baron, a magical cat figurine who helps her listen to the whispers in her heart. Soon, Shizuku's exciting adventures carry her far beyond the boundaries of her imagination.