I'm the Eldest Brother of the Hagihara Family

Blurb: In the world of Detective Conan, the course of the story, an unchangeable fate, and an unknown ending. He wants to live. They want to live. They want the people who matter to them to live. This is the world of Detective Conan. My name is Hagiwara Takuya. Yes, that Hagiwara. I have a thoughtful younger sister and a troublesome younger brother. I am also a Public Security officer, but an accident during a mission turned me into a fake bottle of liquor in the Black Organization. At the moment, the BOSS seems to value me, and I can more or less call Gin a good friend. The kind who does not pull a gun every time we exchange a few words. The people in the organization are fairly easy to get along with, and life is going well enough. But lately, my troublesome little brother is about to graduate from the police academy... P.S. 1. The protagonist is 33 in the first year of the detective timeline. This is mainly a Detective Conan story. 2. The tennis storyline has just begun. This story will include Rikkai Dai winning three consecutive championships, but only in a small part, with very few appearances. It will barely feature at all, so if you want to read Prince of Tennis, don't click in. 3. The Slam Dunk storyline has ended, and only a few characters from it will appear. 4. No CP. The protagonist and Gin are simply using each other. They treat each other as special because of their own unusual circumstances, and there will absolutely be no romance between them. 5. The author is terrible at writing blurbs, so please read with caution. If there are any tropes you can't accept, feel free to ask in the comments. I'll try to respond when I see those questions, since I don't know what everyone's deal-breakers are. Theme: Every hardship will pass