My System's Voice is a Psychopath

I woke up in Tokyo, an 18-year-old again, but beside a dead Yakuza wife and with her enforcers banging on my door. The real terror? The diary of my new body suggested I was the meticulous killer. Just as panic set in, a \"narration\" sparked to life. This isn't some helpful cheat system; it's a darkly humorous, morally bankrupt psychopath, constantly pushing me toward depravity, yet occasionally revealing Tokyo's hidden horrors, like the serial killer lurking on the 5th floor. Now, framed for murder, I must use my past life's detective instincts to survive this city and its predators. Can I clear my name before I become the very monster this voice demands, or before Tokyo's true villains find me?