World Inquisitor Trainer presented in a sci-fi style. The user has to take control of a girl who finds herself in a dangerous situation and an unusual adventure. She is searching for missing officials. Strange events in the city began when the first officials disappeared, after which a series of similar phenomena occurred. The protagonist began an investigation, but she was unable to identify any clues.

The gameplay involves exploring locations and communicating with minor characters. During dialogues, the player must choose one of several lines, which will affect the success of communication and obtaining the required information. Potential witnesses can provide information, but some will need help or other input from the attractive girl. The user will encounter puzzles and mini-games presented in an erotic style.

As the investigation progresses, the heroine learns about a mysterious cult that will try to track down and destroy. When completing quests, gamers will need to look for connections between events that have happened or may happen in the future. The information obtained during the dialogues also affects the success of the search for officials and the solution to the secret cult. In mini-games, erotic scenes are more common. The user can also improve relationships with minor characters in order to watch sexual content.