DxD: System of the Harem King - Chapter 191: Grayfia’s Examination (Part II)

Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and manga, suddenly finds himself summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction.

As the Shield Hero, the weakest of the heroes, all is not as it seems. Naofumi is soon alone, penniless, and betrayed. With no one to turn to, and nowhere to run, he is left with only his shield. Now, Naofumi must rise to become the legendary Shield Hero and save the world!

A man is stabbed by a robber on the run after pushing his coworker and his coworker’s new fiance out of the way. As he lays dying, bleeding on the ground, he hears a voice. This voice is strange and interprets his dying regret of being a virgin by giving him the [Great Sage] unique skill! Is he being made fun of ?!

[WARNING: MATURE CONTENTS]Set in the city of New York, The story begins with Liam and Jenna O'Brien, abandoned by their father, soon later the death of their mother leaving the two siblings in the difficult world.Liam being the father figure wants nothing more than to make sure his kid sis get through school and have a good life, but all that changed when Jenna is wanted for killing three of her classmates, why she did it wasn't much of the question... it was how she did.Now becoming a target of both ghouls and G.I agents [Ghoul Investigators] Both siblings are thrust into a world of pain and rejection, hunted in the city as 'New York's Most Wanted'A young female ghoul, Riley Leah, comes to their recuse giving them a choice of hiding forever or dying.Will they survive the hunt? Or is a sibling bond stronger than any other thing? Well, you will just have to find out.

The dawn era after the end of the half century has gradually rebuilt the order, abandoned civilization, and is full of undivided violence and desire.
The noble and powerful pioneers are in charge of the city, and the evil and mad plagues are in the wilderness.
Pure human beings who cannot mutate are the weakest, dominated by the rulers of the pioneers, and are not as good as animals in the wilderness.
A purely humanized young man with a worldly experience has quietly entered the WTO, holding a three-foot long knife and a long-distance desire to boil in the world of purgatory. From the nameless name to the sorrow of the Supreme Court, the name of the black ride is resounding!

- Description from Uukanshu (translated)