Monster Factory - Chapter 106: Man that ranking

Because of a mission, Bruce White entered prison as a criminal, but his family was abused and bullied as a result. After three years of life in prison, he finally completed his mission. Yet, he received truly shocking news when he came out of prison. His father had passed away, his mother went missing, but he knew nothing about it. Filled to the brim with rage and grief, Bruce gathered his forces and headed towards the city as fast as possible.

Coming from the modern era, she was sent to a strange world. The body she possessed previously belonged to a young woman whose family was thrown away by their clan. However with the “Dan Fu Zong”, the inheritance from her old world, she steps on the path of cultivation, hoping to one day become an immortal.

- Description from Novelupdates

An average man is reincarnated in the world of DxD! How do you survive in a world of battle-hungry monsters? With a cheat skill, of course! Devour the competition, becoming stronger with every fight! From the depths of the Familiar Forest, the Beast King will rise. (Harem, Gamer!SI)

After experiencing heartbreak from being abandoned, he enlisted in the military.

And then, he became a war hero.