Code: Realize: Undying Light in Shrouded Darkness

The marriage life of Cardia Beckford and Arsene Lupin has been going well. Though the peace was interrupted by the return of a familiar organization: Twilight. Its new leader kidnapped Cardia for his evil plan to take over London in her late father's honor. Fortunately, she had been saved by Lupin's old friend, who is a thief just like him but with an alter-ego. She took her to an old friend Cardia remembers upon reuniting with her.

Kathalina Shaw, an American inventor and Cardia's old friend, struggles to trust those she never knows well, yet she grows close to a certain vampire in ways she doesn't know are possible.

Verdell Harrison is a scientist full of romantic fantasies, even if she unintentionally fulfills one after meeting Victor Frankenstein.

Ruhee "Ru" Sutherland is a fairy duchess suffering from a curse similar to Cardia's former poison but feels more comfortable around a certain count, who she falls for despite her fear of her curse not being lifted.

Agatha Wiltz is the old childhood friend of Lupin and a nephalem princess with a tragic past like Abraham Van Helsing's, only to find herself drawn to him even since Twilight killed her fiance not too long ago.

Once Cardia, Lupin and all of her friends unite, everyone must do what they can to stop Twilight and their new leader, who Kathalina reveals to be her traitorous ex-lover since the day she defied him. Defeating Twilight is not the only thing they have to deal with.

Can Kathalina find the courage to trust again through the efforts of Impey? Does Verdell have a chance to gain Victor's heart? Is Ru meant to be free of her curse thanks to Saint? Will Agatha let go of her past with Van's help?