宇宙刑事ステラバン

The Year 1999, July—
A fleet of giant flying saucers arrived on Earth.
Their purpose? To invite Earth’s government to join the Galactic Federation.

This is the story of two brave and beautiful Space Sheriffs—
successors to the legacy of the first generation of cosmic law enforcers—
who fight against even more powerful and sinister alien criminals.

[Translated from dlsite]