Ichika Tachibana, 14, discovers an ancient, broken mirror in an empty campus building on the last day of the school year. When Manatsu, a strange girl from behind the mirror, appears and offers Ichika companionship for the summer, she also provides Ichika magical powers. Manatsu must now assist Ichika in unlocking the abilities of the 12 Djinn in order for her magic training to be completed... but this may prove too tough. Some offers may look to be too good to be true, and this one may end up doing more harm than good.