From the back of the book:
Thou, become a spear piercing evil!
Its name is "Longinus"
The persons protecting the world, becoming the spear for the powerless people. ...
That is "Longinus" under the leadership of Anzelot. In this book we explain, at the same time as putting a spot light on them who have been an unknown existence thus far, the demon lords - strong invading demons coming from the Rikai, as well as the arbiters manging the world.
The End of Childhood
In addition, this book includes the complete replay "The End of Childhood - HUMAN SYSTEM", which is right on the spot for the theme of this book. Its writer is Shinji Tanaka, who has gained a valorous reputation as a player.
You will shed tears, in the bursting "Kawatana" season!