*No romantic pairing. They're longtime friends who love to roast each other. You can ship them if you want, since they're incredibly in sync.
On the fifth anniversary of our failed attempt to end our friendship, my childhood friend and I transmigrated together.
I became a bottle of high-proof, genuine liquor passed down from father to son, generation after generation: Brandy. My childhood friend? He was nowhere to be found.
Before I could abandon my identity, fake my death, and search the whole world for him, Gin gave me a description of my next target: a newly rising detective with a face exactly like my childhood friend's.
I gave up on the fake death plan. In the dark of night, I went to the detective's bedside, determined to be a good "genuine liquor."
Rye's attempt at a direct snipe failed. That was my doing.
Scotch's deliberate attempt to get close failed. That was my doing.
Bourbon's honey trap... Bourbon, stop it!
This guy's homophobic! You need to pick your target carefully before setting a honey trap!
Then my childhood friend threw Bourbon over his shoulder.
I stood on the roof of a distant high-rise, the wind howling in my ears, watching the show through binoculars. Nice work!
Scotch's puzzled voice came from behind me. He said, "...Senpai? What are you looking at?"
Oh, in an excellent mood, I told him I was looking at the person I'd fallen in love with at first sight.
Just as expected, my childhood friend's furious yelling came through the earpiece.
A few days later, my childhood friend told me he'd made contact with the Public Security Bureau through the curly-haired cop he'd happened to rescue the other day.
I replied instantly: Let me see!
When I got there, I saw a familiar blond man, also secretly watching the meeting. His subordinates called him Rei Furuya. I fell into deep thought.
Wait, aren't you the pretty boy secretly involved with that curly-haired cop?
Is this how you do your job in Public Security?!
Brandy appeared in the Organization.
Scotch met him and got a deluxe overtime package in return. No worries, Public Security successfully rescued the target who'd been marked.
Rye met him and the mission failed. All the blame was pinned on Rye. No worries, the FBI got a highly valuable piece of intel.
Bourbon and him... Bourbon never got to meet him.
Before he could meet Brandy, he ran into a detective with a secret. They agreed on a price, and Bourbon invited him to fake his death and disappear before the Organization's next test. After they'd finished talking, the detective suddenly threw him over his shoulder.
Bourbon: ...???
It didn't hurt, but he was completely bewildered.
Fortunately, his partner told him it was all part of the act. Next time they met, the detective would reasonably "die."
A few days later, Bourbon watched the detective's fake-death act from beginning to end, agreed on how they would work together, then happily went to the Organization's training ground. He planned to secretly work with Scotch and tell his dear childhood friend that they were about to gain a new ally.
Scotch stood dumbfounded at the entrance to the training ground and told him Brandy had gone crazy.
Wait, wasn't the love at first sight fake?
*My childhood friend isn't really homophobic. It's a funny misunderstanding between them that became a running joke over five years. Every time, my childhood friend gets furious: "Who are you to look down on my pursuit of freedom! I can accept all fifty genders! (Not really.)"
*Love at first sight is fake. Going crazy is real. The protagonist knows his childhood friend isn't dead, but he's a crazy, fun-loving guy in his own right. Deep down, he's firmly on the good side. I won't write a protagonist who joins the bad guys. Rather than being traumatized, he's letting his true nature out.
*My childhood friend is a hot-tempered guy, but he's extremely dependable. He'll get everything done while cursing and grumbling the whole time.
*The male lead and his childhood friend are both original characters. I mainly realized that the Detective Conan world isn't very friendly to single people or those without childhood friends, so I gave the protagonist one myself.
*There is no such thing as genuine liquor. This is fundamentally a comedic story where everyone gets saved. There's also plenty of bickering with the Whisky Trio as they try to figure out each other's undercover identities. The Bomb Disposal Unit might even get involved, though that could mean poor Class Rep, the only one out of the loop, gets picked on, haha.
Theme: You have a childhood friend? So do I. You and your childhood friend got together? I'm out!