In the year 1234 of the Holy Roman Empire, Ella, the young lady lord of Rottenburg, unexpectedly falls in love with Ruben, a mysterious red-armored knight who robbed her. Ambitious nobles send troops to besiege the castle and cut off supplies, leaving the fortress riddled with internal strife and external threats. Ruben possesses strange flame powers, which he uses to protect the isolated castle out of love. Ella sheds her fragility amid the flames of war, growing into a steel-willed leader. The two evolve from enemies to soulmates, join forces to expose traitors, set deadly traps, fight powerful enemies, and withstand the besieging army. In the fires of the medieval age, they enact an epic tale of forbidden knightly love and the defense of their homeland.
