During a time before the recent event of High School DXD. A Great War had took part before all the epic fights. A Clan known as Death Disciples were fight a war against the devil's pillers and house in order to bring peace across the land but one house took a turn against all others and made die hard movements against Death's Clan. The Leader Known As Death Scythe and three children name Reaper Scythe, Scythe Death & Angel Scythe. And there Mother was Density Scythe. The Death Clan had others members know as Reaper tribe and Grim tribe. But turn a of event with the family blood had those whom were close to Density betrayed the family and pack. Changing the war and fight among Death Disciples. During the battle Death children took part in the war. Reaper was posted in the Southeast Garrison. Angel was posted at Southwest Garrison. Scythe was post at the center garrison. As battle rage on Death's force was quickly decreasing morale and d deflecting to the other side leave the main base garrison defenseless. Scythe saw that movement and quickly fall back as everyone else was trying to push forward. Scythe felt the bad aura against the extra force we had. Scythe took a messager to his brother and sister to fall back but it was to late. As Death show me retreating from the frontlines. Wait my son where are you going ? I need to save mother. Scythe quick race to his mother but his Uncle's had deflected and had tried to stop Scythe. You bastards will die!! All of you!! As their stands 9000 men killing them all with brute force. As all the blood was shed. I step in the garrison and looking forward seeing my mother dead there as the devil stood their laughing at all us. As my father, brother and sister arrived shortly. They were all shocked. I stood fill with dark aura energy within me thrsting for blood and revenge. And held my weapon ready and quietly dash toward the devil to kill him. As I took a hit he disappeared and laughed. You mirror boy you never kill me. But you'll service me soon. Death said no my son!!! I stood there look at my mother body and said get her out here now. I head forward toward battlefield and quickly start fighting back as our real forces start march forward. My brother Reaper took a stand and push forward. My Sister took our father and mother away to escape. Now that our forces was cut in half my brother forces saw that they can't continue on with this fighting and told me. Brother we need retreat from this battlefield we have no chance on winning this war we'll live to have other day. During time of the great war his family morale broke dividing everyone to chao and fighting among each other. Hell was rising among the realm of shadows.