Constancia is a science fiction visual novel in full development, set in the near future. A middle-aged human, survivor of a devastating nuclear war, awakens in the infirmary of an underground facility, still operating and unaware of the consequences of the nuclear disaster that occurs outside. With some amnesia and, above all, a hatred for human decisions, he will have to protect himself of his own free will in the facility guarded by the only functional android, which is responsible for safeguarding the remainder of what was once a human corporation.

The story unfolds through the protagonist's perspective, using first-person narrative. The game uses a traditional text-based visual novel model and sprites.