Summary
Raven Valt, the second son of a lowly nobleman, had been branded as a traitor. With the promise of a pardon, he was sent to fight monsters with the worst unit in the world, the “Rakshasa” Corps.
Raven survived ten years in a place where most only lasted one. One day before his pardon, he was on his final mission on the battlefield alongside Eren Pendragon, heir to the Pendragon Duchy… when everything crumbled before his very eyes.
Another synopsis :
The demonic army is where the worst of the worst gather. A man who survived for close to ten years, the illegitimate son of the Valt family, Raven Valt, is assigned to accompany Duke Alan Pendragon, the contractor of the white dragon, and be his guard. But due to an unknown conspiracy he is killed along with the duke and his dragon, Soldrake. When he opens his eyes, he’s back seven years in the past, and even more strangely, as Alan Pendragon