

As children, Gigi Murray and Milo Sanford made a pinky promise to marry each other. Eighteen years later, Milo has become mentally impaired, but Gigi remains devoted and marries him. After a fateful accident, Milo regains his memory, only to discover that the person who killed his parents is none other than Gigi's adoptive father. Consumed by rage, Milo turns against Gigi. Amidst the turmoil, Gigi's true identity is revealed, uncovering a web of secrets and betrayal.

In the 262nd year of the Dragova Era, melting polar glaciers and rising seas swallow countless nations. Ancient sea beasts awaken, invading human lands. On January 1 of year 263, the Rank-10 beasts strike humanity’s last territory, Taelsky. Led by General Alaric Thorne, the elite Dragova Squad fights bravely—but by March 12, they are all annihilated.