Mitou Shoukan://Blood-Sign - Volume 2, Ending X-01 - After the Nice Ending

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

[Vest flow, semi-invincible, Conan colleagues]

Interview with the protagonist:

Q1: What is your secret to becoming the ace shark player of the Black Organization?

Jiang Xia: “Take Conan to the target’s house for a walk.”

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Q2: What’s your secret to retrieving the treasures stolen by Kidd many times?

Jiang Xia: “His accomplice is my vest.”

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An interview with the detectives of Kexue World:

Q1: How do you view Jiangxia?

Detectives: “Except for solving the case too quickly + being unable to hold people back, there are no other shortcomings.”

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Q2: As a high school detective, why not join forces with Jiang Xia to fight against the Black Organization?

Detectives (hurriedly wave their hands): “No no no, can’t tell him that the darkness of the world is too heavy for him.”

- Description from novelbuddy

Caelith doesn't want too much in life, a clean home, a happy mother, and maybe a girlfriend. Raised in the Stormont manner, one of the highest ranking noble household in the kingdom, he grew up a bastard, mistreated and abused by the main lineage.At the tender age of sixteen nobles undergo a divine ceremony, receiving the opportunity to be blessed by the gods however he receives Nothing.Caelith struggles in this world but at the end of the day, He is Nobody, and he has Nothing.

A huge guy is bawling his eyes out. In this day and age? Sure, maybe the world changed while I was away in that other place. I’m not some old-fashioned boomer.But what if that guy is clinging to my pant leg, sobbing and sniffling—And we’re not even acquaintances?Even in modern times, that’s just messed up. Ask any passing kid, they’d agree.So yeah, I shook my leg. He was gross and too close.“The hell’s wrong with you? Crying just ’cause you saw a ghost?” “N-no! I swear, it was really there! You didn’t see it!!”I let the disrespect slide. Barely. He was asking for help and still talking down to me just because I look young?Obviously, I’m not the one who lost his balls. He is.And yet… when I looked where he pointed—Something was there.I threw some coarse salt and looked again.He stared at me like I was insane, but I ignored it.…Yeah. Something was definitely there.It made eye contact.