Ep. 12: Yuu defeats Kili to advance his plan against Basilisk while students destroy the dragon using Babel.

Yuu defeats Kili to determine Tear's fate, ordering her to live as a human. Kili kisses Yuu, urging him to prove his superiority over dragons by destroying Basilisk. Mitsuki creates a comprehensive strategy for the battle. The students drop the Mistileteinn, protecting it from Basilisk's initial third-eye beam. Although the eye fires a second, faster discharge that destroys the device, the blast allows the students to disable the eye during its recharge. They immobilize Basilisk, enabling Yuu to destroy it with Babel. The group returns to Midgar, where Mitsuki adopts a more optimistic outlook. Yuu confesses his contract with Yggdrasil and memory loss to Iris, who vows to stay with him and preserve their shared memories.

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