The House in Fata Morgana is a visual novel that follows the story of two main characters, Yūichi and Mayu, as they uncover the dark secrets behind a mysterious house. The game takes place in 2016 and revolves around the twins' journey to unravel the mysteries of their family's past. As they delve deeper into the truth, they begin to question everything they thought they knew about themselves and their connection to the enigmatic house.
The gameplay is centered around choice-making and interaction with characters, similar to a visual novel. Players can make decisions that affect the story, influencing relationships between characters and uncovering new information. The game features multiple endings, depending on the player's choices throughout the story, adding replay value to the experience.