娼館を統べる闇の貴族に転生した ～美少女たちと二重生活のハーレムライフ～

I died after being hit by a train due to lightheadedness from overwork... but when I came to, I had been reincarnated in another world as a baby of the noble Walch family...!! The civilization Level was around the modern era, so it looked like I could live without any inconveniences——. However, the Walch family actually had a secret undercover business, and at the age of 14, I became the Mafia Boss who rules the red-light district...!!?