The deserted island turns out to be a research facility owned by Magus Craft where Kanon's father, Kensei, conducts research. Kojou and Yukina are attacked by a vanguard force, but the one to save them from danger is Princess La Folia of Aldeigia, a young woman with deep connections to both Kanon and Kojou.

When Kojou is disabled in the battle with Kanon, Yukina retreats with him behind La Folia's barrier. Both Yukina and La Folia share their blood with Kojou to aid in his recovery and the awakening of a new power. They have no choice but to rush to Kanon's rescue as her ego slips beyond control and she loses her grip on her humanity.

Yuuma's goal was to use the Fourth Progenitor's magic power to free her mother from the prison barrier. In accordance with her plans, the prison barrier appears above the ocean's surface near Itogami Island.

Yukina and the other middle school girls are preparing to embark on Saikai Academy's traditional training camp. Yukina is worried about leaving Kojou as she has been released from her observer duties for the trip's duration, but Kojou tells her with a smile to go enjoy her time off.

Kojo and the others go to rescue Asagi, who was imprisoned on the 0th floor of the Keystone Gate. Kojo is worried about Himeragi's poor condition, but Himeragi goes with Kojo nonetheless. What was waiting for Kojo and Himeragi on the 0th floor?

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