The Iron-Blood Valkyrie, Veronica Lautreamont reunites with her little sister, Silvia after 4 years. Disappointed with her sister's progress as a Dragonar, she commences an arranged marriage with Glenn McGuire, her bodyguard and once her brother's best friend. As Silvia struggles against the "iron-fist" pressure of her sister, a terrorist attack is launched on the church she is praying, led by the well-known assassin, Avdocha the Convicted.
