After Matsuda Reincarnates as Takagi

After Matsuda Jinpei, a bomb disposal officer in the Tokyo Metropolitan Police Department's First Investigative Division, dies in the line of duty, he discovers that not only did he fail to stay dead, but he's also become an ordinary patrol officer named Takagi Wataru.

Well, what else can he do? Keep pursuing his revenge.

But... what do you mean some shady, black-clad organization has sent a cheat to kill this guy?

What do you mean the only cheat I got is that I can't die?

How is this supposed to work?

Just as Matsuda decides that everything has gone completely off the rails, a voice suddenly speaks in his head: "But isn't that a good thing?"

Matsuda: Get lost. If you want to experience every kind of outrageous death, just say so...

Matsuda: Wait.

Matsuda: Hey, what do you mean I transmigrated, but the body's original owner is still here!?

1. Serious tone. Set three years before the Conan timeline, essentially covering the origin story.

2. Matsuda's characterization follows my take on him across all periods. No CP, and the canon romance is extremely minor. The melodramatic plot points you're worried about basically won't appear.

3. The author is a true fan of the original, and loves the entire cast. Most characters, popular or obscure, will be mentioned, and the entire police academy group will appear, alive or dead (?).

Theme: Order is above all individual personalities.