Movie
Description
Hisca Aiheap is a senior human Imperial Knight in the Niren Brigade stationed near Shizontania, outranking newer recruits Yuri Lowell and Flynn Scifo. She serves alongside her identical twin sister, Chastel Aiheap, under Captain Niren Fedrok's command. Both sisters share distinctive red hair and yellow eyes, though Hisca possesses a flatter chest, providing a physical distinction. Their personalities differ significantly; Hisca is more stubborn and assertive compared to Chastel's gentler nature. This assertiveness leads Hisca to frequently correct or reprimand Yuri for his impulsive actions during missions.

Originating from Zaphias, the imperial capital, Hisca and Chastel were experienced members of the brigade before Yuri and Flynn's enlistment. The twins maintain a close bond and are consistently deployed together. During the investigation into abnormal aer emissions near Shizontania, Hisca participates in field operations, setting blastia traps while evading monster packs. She demonstrates combat capability by deploying a Force Field technique to coordinate with Captain Niren's activation of blastia devices to eliminate threats. Her technical expertise includes blastia usage, evident when Yuri requests she demonstrate her Bodhi blastia, equipment typically unavailable to rookies.

When Captain Niren divides the team to address crises caused by corrupted aer leading to monstrous mutations and environmental decay, Hisca remains stationed in Shizontania with Yuri. Their duties include caring for Niren's hound, Lambert, and his pup, Repede. During a town defense against an aer-formed monster, the creature possesses Lambert and other wardogs, driving them into a violent frenzy. When the enraged Lambert attacks Hisca, Yuri intervenes and kills the animal to protect her, contributing to growing tensions within the brigade.

Following Captain Niren's death during the mission to neutralize the aer corruption source at a fortress, and the subsequent evacuation of Shizontania due to failed barrier blastia, Hisca's involvement concludes as the surviving knights part ways. Beyond the film, Hisca appears in a sidequest within the PlayStation 3 version and Definitive Edition of the related game, though not in the original Xbox 360 release.