Detective Xeno And The Seven Locked Murder Rooms.
It portrays Detective Xeno, who fainted on the side of a road, bloodied and was admitted to a hospital.
And as soon as he woke up, he said he is going to solve a murder in that hospital!
Xeno himself suffers from amnesia, has no idea about his identity or where he live.
But since then, after leaving the hospital, he started an investigative firm.
And in a short time he manage to uncover a variety of big cases.