Ten years after a tragic accident in which the parents of two sisters died, Helena and Emily live together in support of each other. At night, Emily's screams are heard. Helena runs to her sister's aid and sees a horrible picture: a tentacle monster has filled the entire room and is about to rape the girl... Héléna is at a loss... Then out of nowhere a "rice cake" named Ovi appears and offers the girl to become a sorceress so she can save her sister. But it's not that simple. Now she will have to save not only her sister and herself, but the Earth as a whole from the creepy monsters, the Zoroids.