Moon Guard by Grom

In the boundless expanse of space, a solitary astronaut drifts after losing contact with his vessel. As darkness closes in, a tiny moon, concealed among the stars, begins to radiate a soft, steady glow. Drawn by its enigmatic light, the astronaut approaches. Upon reaching it, he discovers the moon is smaller than expected, but unbeknownst to him, it conceals an ancient, formidable power. Gradually, his body transforms, granting him unimaginable superhuman abilities. Now, lost yet stronger than ever, the astronaut finds a new mission on the moon: to rescue the remaining moons and their planets.