Ribati muryō is an ordinary girl who transferred to a Japanese school where she has trouble making friends because she is American. Late at night she prays outside her window while she spots a shooting star going straight for her when she finally sees who it is, she realizes that its a fairy Mascot. When Monsters invade she is taught to be a legendary Magical warrior, a Prisma. She meets three other girls who have trouble like her. They team up to save everyone's hearts.