Movie
Description
Kotona Takashima lives as an ordinary high school student facing a life-threatening malignant tumor. Her existence becomes fatefully linked to her otherworldly counterpart when both confront mortal danger simultaneously.

Astrid Astrum is princess of the parallel realm Evermore, daughter of King Fidelius Astrum and niece of Crown Prince Sedulus Astrum. Her mother's death in childhood left her two legacies: the protective Aegis Spell and a specialized dagger capable of nullifying magical barriers. Astrid demonstrates kindness and a strong sense of justice, desiring authentic friendships over the superficial connections her royal status often attracts. Despite her position, she maintains a down-to-earth perspective and actively protests injustice, opposing the mistreatment of kingdom visitors and challenging the Colosseum battles. Her formidable magical abilities, recognized as exceptionally powerful, include combat with a staff, employing the Aegis Spell that harms attackers upon contact, and performing the purification Magic Sealing Dance at the Lake of Purity to remove curses. This ritual proves crucial for her recovery after a near-fatal stabbing by a cursed dagger wielded by a hooded assailant.

The physical connection between Kotona and Astrid means harm to one affects the other. This link drives critical decisions when Kotona's tumor threatens her life, prompting proposals for extreme measures to sever it. During the conflict, Astrid provides her mother's barrier-piercing dagger to allies confronting the primary antagonist – revealed as her uncle Sedulus disguised as the court mage Gnauss. Evidence implicating him in the assassination attempt surfaces when damage from the Aegis Spell becomes visible on his body. Astrid actively participates in the decisive battle against the transformed Galeroth alongside her allies.

Following the antagonist's defeat, a portal opens between worlds. While her counterpart Kotona survives in the ordinary world, memories fade for those connected to the events. Astrid remains in Evermore, ascending to rulership alongside the individual who chose to stay in her realm.