Magic Moon: Two Worlds (Vol. 3):

(Note: "Stand-alone" - May be read before the first two volumes or out of order.) Magic Moon is a cool, quirky, gigantic, somewhat terrifying, alien "moon-like" being who likes puns and jokes when he's not accidentally causing small earthquakes! He may grant two special requests with his magical powers if you are brave enough to face him! Magic Moon's world is dying. A mother and her two children must set off to find safety in another world. But when disaster strikes, it's up to one girl to...