Beluga operates as an antagonist in the Cosmic Fantasy OVA, deploying a false distress signal to lure and trap Yuu's crew. After Yuu rejects her partnership offer, she confines him and Monmo aboard their disabled ship with a proton bomb. Following the explosion and Yuu's prolonged unconsciousness, Saya confronts Beluga in self-reproach, sparking a duel. Beluga feigns surrender during the fight, then activates a cat-shaped mecha to subdue Saya. She whips and taunts her opponent, blending physical violence with psychological torment. When Yuu psychically detects Saya's peril and telekinetically intervenes, Beluga retaliates by assaulting both with her mecha. Yuu ultimately defeats her using a summoned greatsword, compelling her retreat. Her actions stem from personal ambition and resentment over Yuu's rejection.