Travel Through Time and Become the Main DN of Matsuda Momota's Comprehensive Comics

This was a hospital in the Kanto region. When he woke up, a middle-aged man in a police uniform told him that he was his subordinate, Momota Matsuda. During a shootout with a gunman, he fell, injured his head, and lost his memory. Fortunately, this fall caused the gangster to be stunned, giving subsequent officers an opportunity to take advantage. He was an orphan, but his only sister was killed by gangsters, so he became a policeman. I am twenty-one years old this year.