Witnessing a murder and loseing a friend in an accident, Yuki Leviane transfers to another school in half of her first year in middle school hoping that she could forget her past and move on.But unfortunately she and her first friend, Touma Ashley who is the head of delinquents, fall in a well which was sealed for many years.And to their suprise it was the gateway to a parallel world !!! What will they do? How will they survive in the strange world? Why did Leviane's locket, which was given by her childhood friend, shine under the full moom and what is the tatoo that appears on their body? Fragments of Arcana? Whats that? Leviane and her friends are going unreveal a great mystery and will face a lot of adventure.