With the Class Cards all captured, Illya and Miyu commence their normal lives. Later, their beach trip is put on hold as Rin and Luvia appear with a new assignment.
Kuro's wish to destroy Illya prompts Rin to create a blood seal between the two. Kuro's escape spells a world of trouble for Illya when Kuro begins kissing all her classmates.
Kuro Illya's intentions are laid bare after a bizarre confrontation at Luvia's luxurious mansion. Illya's words are used against her as her darker counterpart attempts to convince Miyu to turn to her side.
Miyu and Kuro fail to come to a compromise, and a battle for Illya begins. Later, a familial figure returns and Illya finally finds out why Kuro is the way she is.
In order to win their older brother's affection, Kuro and Illya have a cook off at school, where their friends help, or in Illya's case, hinder each girl's plans. Later, a debate on who should be the "older sister" engulfs the entire family.
While Kuro and Illya are enjoying their new camaraderie and life outside of capturing Class Card, a new opponent has slipped into town. First stop: Luvia's mansion.
Bazett has gained the upper hand and her mission to retrieve the Class Cards is almost at an end. With Luvia and Rin's fates unknown, Illya and Kuro will need a miracle to stop their predecessor's rampage.
The combined strength of Illya, Miyu, Kuro, Rin and Luvia might not be enough to contain the raw power of Bazett. As the mansion crumbles around them, a trump card is played that could spell total victory or ultimate defeat.
