My Years as a Police Officer in Japan

In his previous life, he was a criminal police officer who died heroically while apprehending a criminal. The good news was that he was reborn in a parallel-world Japan. The bad news was that the previous owner of this body... Had joined a gang as a teenager, had tattoos covering his back, a rap sheet as long as his arm, shady friends everywhere, and had tangled with countless women. There was nothing for it. For the sake of his dream of becoming a police officer, Takahashi Eiji had to start out undercover.