The action takes place around the year 1081, when an ancient demon hears Moura's laments for her fallen love and uses her tears to create a magic key, which unleashes demons into the Kingdom of Castile. King Alfonso VI of León orders Don Ramiro, Quesada, Don Diego, and Mendoza, to Tolomera to end the demonic nightmare that looms over the kingdom. As the demons get to his comrades, however, Don Ramiro must fight alone to rescue them and bring peace to the land.