London Detective Mysteria[a] is a 2013 otome visual novel video game for the PlayStation Portable created by Karin Entertainment and published by Marvelous in Japan.

This version includes extra scenarios, a slightly different voice cast and a new artist.

[1] English Detective Mysteria is classified as an otome game; like most otome games, the player takes the role of the main female character, Emily, who can choose from a variety of male characters as her love interest.

Besides Sherlock Holmes' and Watson' respective offspring, the game features Sara Marple, niece of Agatha Christie's Jane Marple and Jean Lupin, son of the French thief Arsène Lupin created by Maurice Leblanc.

Characters Kenichirou Akechi and Seiji Kobayashi are an homage to Edogawa Ranpo's mystery series protagonists Kogoro Akechi and stepson Yoshio Kobayashi.