Ciel features in Carnival Phantasm during comedic segments parodying her Tsukihime persona, exaggerating traits for humor while preserving core aspects of her background. Her primary appearance occurs in Episode 2, "Badump! Melty Blood," where she competes fiercely in a beach volleyball tournament hosted by the Tohno family. The event pits female Tsukihime characters against each other; Ciel joins Arcueid Brunestud and Miyako on the "White Team." Though promoting friendship is the stated aim, the grand prize—a private night with Shiki Tohno—ignites intense rivalry. During the chaotic match, Ciel aggressively pursues the MVP title, charging forward only to become a frequent target for volleyballs hitting her face, contrasting her usual calm school demeanor. The competition escalates wildly, unleashing special moves that reduce the beach environment to rubble.

This segment prominently highlights her canonical obsession with curry through a gag where a volleyball strike sends curry flying toward her. This references her established character trait where curry items, like "Fried Curry Bread," carry exaggerated humorous effects such as "instant death." While her physical attributes align with the series' occasional fan-service elements, they are not directly addressed in this appearance. Her dual identity as a Burial Agency member and undercover high school student remains intact, though simplified for the parody context. The volleyball scenario focuses on comedic rivalry with heroines like Akiha and Arcueid over Shiki, foregoing exploration of her backstory involving immortality or her vendetta against Roa. Her role is confined to this specific episodic appearance, absent from recurring segments like "Afterschool Alleyway Alliance" or "Phantas-Moon."