Uta — the most beloved singer in the world. Her voice, which she sings with while concealing her true identity, has been described as “otherworldly.” She will appear in public for the first time at a live concert. As the venue fills with all kinds of Uta fans — excited pirates, the Navy watching closely, and the Straw Hats led by Luffy who simply came to enjoy her sonorous performance — the voice that the whole world has been waiting for is about to resound.
This story revolves around a spirited, carefree boy named Kazuma Harukaze, who lives with his little sister Sakura and his horse Lovely on a farm within sight of Mt. Fuji. One day, a "meteor" lands nearby, and it turns out to be Hinkeeru — a messenger from Muzanda who has come to warn Earth of a grave danger — and a robot horse named Robony.
