A Love Across Time and Space

What? Is this some kind of mistake? The space is in danger, and you want an ordinary girl like me to save the world? Are you kidding me? But I never expected to meet so many handsome guys along the way. This mission isn't so bad after all!

And so, the ordinary girl takes on missions while collecting handsome men. But she never imagined that once she unraveled all those tangled mysteries, they would turn out to be the same person. What is she supposed to do now?