Subaru Natsuki is determined to make it through the Pleiades Tower without losing anyone, and hes willing to die however many times it takes. Its going to take more than just guts to get everyone out and Subarus still only one man. Luckily, his friends wont let him brave the challenges of the tower alone. And then it appears--his own book of the dead, a record of pasts that never came to be...