Since ancient times, the members and descendants of the Al’Pecearian "Staradiance Guardian Squad" had been crucial in saving Earth and the entire solar system. Two and a half billion years ago, the Modorian sought to seize the cosmic-level energy entity known as "Staradiance". The Guardian Squad brought "Staradiance" to the solar system. To prevent the Modorian from launching the "Hyperdimensional Corona" to destroy Earth, Captain Luna sacrificed herself. Her "Staradiance" power was transformed into genetic code passed down through generations. The spaceship of the "Staradiance Guardian Squad", Luna 81, became the Moon; the Modorian light radiation weapon was called the "Sun" by Earthlings.In 2082, "Dawnstar" Lucia and her lover "Shadow" Adrian were both super-vigilantes, vigilantes with superpowers. When the "Healer", who eliminated superhumans, appeared, Lucia wanted to retire, but Adrian wished to continue his duty. The super-vigilantes needed to find the "Staradiance" inheritor who would sacrifice themselves to save humanity. Pregnant Lucia faced the cruel choice of sacrificing herself and her unborn child.