Naminé will attempt to explain that one time that a shady Organization tried to create a heart-shaped moon by collecting hearts in an effort to achieve their long-term goals. She probably won't get into the details of any of it, since a lot of it's kind of sensitive material for her, but she will definitely be willing to provide a hand-drawn picture!

Beyond that, there are plenty of other moons in various other worlds that she can describe as well, although she's a bit spotty on the lore for any of them. (Other than that the moon in the last world she visited before coming to Songerein was haunted, apparently???)