In the near future, a huge ring suddenly appears on the moon. From this ring emerge mysterious beings known as “Gremlins”, who use copies of humankind’s most powerful weapons to begin their invasion of Earth.“Hoka” – a girl bestowed with the power of the Magical Cannon – encounters the Gremlins, as well as a mysterious young girl who seems to control them. Just what is the Magical Cannon? And just what is up with these Gremlins and this mysterious young girl? Will Hoka & co. be able to bring peace and happiness back to Earth? Or will they – and the world at large – end up completely destroyed...?!