This is the story where Urahara Kisuke died after Nel failed to save him inside Askin's Gift Ball Delux and reincarnated in the world of DxD.I am not sure if I can capture Urahara's character properly so I apologize in advance if you are not satisfied.Also, English is not my native language.I don't own any of the characters from the canon.

[System is assimilating Earth with the rest of the Vast Universe.]
[A Trial Program is needed for efficient assimilation and for that data needs to be recorded from 1111 individuals with Higher Potential Innate Abilities from the assimilating Planet.]
[This Trial Program was further divided into 3 Sub Programs namely, ALPHA Program, BETA Program and GAMMA Program.]
[Congratulations! You are one of the 11 Chosen individuals among 7.8 billion for the ALPHA Program.]
[As a Chosen member among 11 individuals of Alpha Program you will be one of the first to start the Trial Program.]
[When the Trial Program ends, the assimilation with Earth begins.]
[Survive, overcome danger and grow stronger. All the Best.]

Su Xiao is a cold-blooded young adult who's seeking vengeance for the death of his family, yet things ended up badly for him.
As he was taking his last breaths, he heard a voice calling him from dimensions, it was a strange system reaching him, asking him if he wanted to be saved, to be Reincarnated.
He just needed to accept a contract, Su Xiao didn't have any choice but to do so, but he didn't know what he signed up for!!
Travelling through worlds, doing extremely dangerous missions, collecting special items, levelling up, and even killing Protagonists...
But Su Xiao wasn't any ordinary Contractor, Su Xiao was a Hunter!
The MC crosses over to: One Piece, Tokyo Ghoul, Naruto, Fullmetal Alchemist, Attack on Titans... and Author's Original Worlds...

(Naruto World)
In the 56th year of the Konoha calendar, Akatsuki added two more members, one of whom was named Uchiha Itachi and the other named Uehara Naraku.
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(One Piece World)
That year, the Baroque Work recruited new employees, and the president, Warlord Crocodile, held a smoking pipe and looked at some resumes with satisfaction. One of the resumes was a young man smiling very kindly. He called Uehara Naraku.
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(Overlord World)
The Great Tomb of Nazarick.
The Ainz Ooal Gown guild members gather here, and they will carry out the last guild activity before the game closing service. Momonga looked at his friend and said in a deep voice, \