Seira Kaganohara overcomes rigorous training to become Yellow Spark, a member of the Shunko Sentai Sparkman, chasing after her former rival and close friend, Luna Hanabishi. Luna, resentful after losing the competition to become Yellow Spark, attacks Seira, inflicting severe injuries before vanishing without a trace. As Seira pursues her, she is ambushed by Luna—who has now become a high-ranking officer of the demonic empire Meis known as Nephela—and the monster Zi Harigisu, ultimately being captured. Seeking both revenge and pleasure, Luna subjects Seira to extreme torment, driving countless needles into her breasts and pulling her nipples with fishing hooks. Even when Seira transforms into Yellow Spark, Zi Harigisu's iron needle attacks destroy her powered suit, leaving her powerless and defeated. Luna torments Seira relentlessly, ultimately breaking her mind and body completely through vicious and cruel torture.