Ginga no Uo Ursa Minor Blue

Ursa Minor Blue follows Urey, a boy who resides in a laboratory situated on a lake with an elderly caretaker. They discover a peculiar star in the Little Dipper constellation, which eventually disappears. As the constellations change, the Little Dipper transforms into a fish shape. Urey and the caretaker set out to navigate the Milky Way to find the source of the celestial anomalies.