The story follows Detective Xeno, who after being found collapsed at the side of a road covered in blood and was taken to a hospital the first thing he said upon awakening was solving a murder that happened in the hospital! Xeno himself has no memory of who he is or where he came from, but after that huge incident and after leaving the hospital, he opened up a detective agency and in just a year he solved some high-profile cases.
Detective Xeno and the Seven Locked Murder Rooms is a completed manga by Nanatsuki Kyouichi, first published in 2017. It blends psychological, crime, drama and mystery. You can read all 83 available chapters of Detective Xeno and the Seven Locked Murder Rooms online for free on MangaPulse; the newest is Chapter 79, added 2023-05-10. The series is finished, so you can read it from start to end in one go.