Rui Kamishiro/ Mafia?

Tsukasa Tenma is an officer whose duty is to monitor the safety of the city. There is a dangerous organization on their streets... Something like the mafia. There was no way to catch them all, but Tsukasa really wanted to achieve this!
It just so happened that Tsukasa was caught instead.
Now he was standing in the office with his hands tied behind his back, while an unknown man was holding the muzzle of a pistol to his head, threatening to shoot for any resistance.
After a while, another man came into the office, although much taller. And if you looked closely, you could tell who it was...
"Fu-fu, hello, Officer... I see that you want to interfere with our actions very much. And to be honest, you are doing it. However, it's not the best decision for us to cross the path of someone like that..."
Rui finished while the guards followed him out of the office.