The land of Aquafall is a paradise, where life in all forms flourishes in peace and abundance. But when meteors rain down, each impact spawns hideous monsters sent by an enemy that wants to claim the green world for its own! Fortunately, the fairy Syrup is on guard and knows exactly what to do, and recruits an extraordinary team of young women to form the Aquafall Defenders. There's the incredibly strong Jormungand, the fire-conjuring Bahamut, and the water-bending Leviathan. Unfortunately none of them are ideal warrior material, and Syrup will have her work cut out for her when it comes to teaching them to work together. Even if they manage to survive and unite as a team, can three lone girls really turn the tide of an alien invasion? Well, it might help that they've all got a little bit of Dragon in them! The scales of fate will turn as the future of Aquafall hangs in the balance in LEVIATHAN ~ THE LAST DEFENSE!