'Kagero: Deception II' formed the foundation of current Deception titles and would be built upon in future titles, coming out two years after its predecessor. In it, players assume the role of Millennia, a young girl being used as a puppet and guard for a race known as Timenoids.
Source: Wikipedia, "Deception series", available under the CC-BY-SA License.
The player must set traps and kill the human invaders of their castle. New traps and improvements to old traps become available as the body-count increases.