らいむすたーず☆えろーす

This is "Lamelo Land", a world full of magic and wonder. People lived peacefully there under the rule of a kind hearted goddess, but one day the sun suddenly grows dark, and the invasion of the Demon Army begins. Their purpose is to destroy the sun and open the gate to the Makai world.
Now fairy with the blessing of the goddess descends to a courageous boy. Together they go on a journey to save the world.