Twenty-One Days with Luna

Twenty-One Days with Luna is a dark fantasy management simulation. During a limited twenty-one-day period, players influence three central values: desire, pride, and fear. Research, facility upgrades, alchemy, and other systems provide money and materials for different development plans.

The story follows Lehi and Luna, childhood companions from a town near the human border. Their relationship falls apart when Luna begins awakening to her succubus nature, and Lehi later leaves for the royal capital to become a magical researcher.

Years later, a war breaks out between the human realm and the succubus nation. A special interference device developed by Lehi gives the human side a decisive advantage, and Luna is eventually brought to his tower as a research subject.

The military contract lasts twenty-one days. Decisions made during that period, together with the three character values, lead to different endings and may unlock a special conclusion.