In the twelfth episode of "Tate no Yuusha no Nariagari" Season 3, titled "The Ones We Must Protect," Naofumi, Sadeena, and Gaelion begin refining their training, only to be interrupted by the power of shared drinks, which reveal their effects on Raphtalia and Gaelion.

The episode takes a decisive turn when Elhart, a seasoned blacksmith, gifts Raphtalia a new miko outfit. What initially appears to be a simple change of clothes carries deep cultural significance: It symbolizes Raphtalia's lineage as a descendant of the Heavenly Emperor of Q'ten Lo. Through this revelation, she is inadvertently thrust into a political maelstrom, becoming a potential heir to the throne.

The village's peace is shattered when assassins from Q'ten Lo launch a sudden attack. Their target is Raphtalia, whose new attire is misinterpreted as a declaration of war against the reigning emperor. Naofumi and his allies spring into action to defend their home against the skilled assailants. Quickly, they uncover a troubling truth: The assassins are immune to the heroes' attacks, forcing them to adapt and employ chorus magic to create a disorienting illusion that shifts the tide of battle.

Sadeena reveals the truth about Raphtalia's royal heritage, explaining how her parents fled the political turmoil of Q'ten Lo for the relative safety of Melromarc. The miko attire, traditionally reserved for the Heavenly Empress, is now seen as a symbol of Raphtalia's illegitimate claim to the throne—a misunderstanding with devastating consequences.

Faced with the relentless threat from Q'ten Lo and the need to protect his companions, Naofumi makes a critical decision. He resolves to confront the island nation directly, prepared to use force if necessary to safeguard those entrusted to him. With the Phoenix's revival looming on the horizon, Naofumi's priorities are clear: He must swiftly resolve the conflict with Q'ten Lo to focus on the impending battle.

By the episode's end, Naofumi sets out for Q'ten Lo, accompanied by Wyndia and Gaelion.