The game takes place in Ikoma Aku Torres Actress School where different girls go to grow their perfomance abilities, and one night when a performing is taking place the owner of the school jump off a roof to the death. The police think that is just a suicide, but the motive is still a mystery, so the people on charge of the school decide to hire a private detective (Kiyouiti Kusakabe) to make an investigation. So when they hire him they decide that he enters the school as a new instructor in the academy. That's when the game begins.
Gensou no Altemis - Actress School Mystery Adventure is a first person perspective adventure game in which the player takes the role of a detective that has to investigate a murder in an actress school, the game at the beginning let the player choose between 5 different girls to help him in his investigation, each of them got a different story and the game will go in a different way depending of that choice, and also the ending.
The main part of the game is to solve the case but during the investigation the player will also talk to different people and girls and there is a chance of a possible romance with any of them, so the game is also a dating simulation.
