Chou Tantei Jikenbo: Rain Code

The amnesiac protagonist, Yuma, wakes up at a train station and discovers through his luggage that he is a detective working on a case. Yuma heads for "Kanai Ward," where he was supposed to investigate the case with the Shinigami who haunts him. However, an incident occurs on the train they are on...? Note: This manga is an adaptation of the game *"Master Detective Archives: Rain Code"*