Arcade — This visual novel has many scenes set in an amusement arcade, the protagonist and/or main characters often seen playing arcade games there. An amusement arcade (often referred to as a video arcade, amusements or simply arcade) is a venue where people play arcade games, including arcade video games, pinball machines, electro-mechanical games, redemption games, merchandisers (such as claw cranes),.
Archaeology — The story of the game features archaeology. Archaeology is the study of human activity through the recovery and analysis of material culture. The discipline involves surveying, excavation, and eventually analysis of data collected, to learn more about the past.
Arcology — Some part of the game takes place in an Arcology. Arcology, combining "architecture" and "ecology", is a set of architectural design principles aimed toward the design of enormous habitats (hyperstructures) of extremely high human population density. These largely hypothetical structures would contain a variety of residential, commercial, and agricultural facilities and minimize individual human.