Episode 4 picks up where the last episode left off: Terakomari Gandesblood faces Millicent Bluenight in the ruins of La Nelient City. Millicent reveals her campaign of revenge against Terakomari, stemming from an incident three years prior involving a pendant and the ability to trigger a core implosion. Millicent holds Terakomari responsible for the downfall of her family and her own suffering.

The episode delves into Millicent’s past, showing how she trained rigorously under Master Amatsu’s guidance to unlock the core implosion ability. Despite her efforts, she fails to activate the ability, leading to her father’s disappointment and her own humiliation. Millicent’s life takes a dark turn as she joins the terrorist organization "Inverse Moon."

Back in the present, the confrontation between Terakomari and Millicent escalates. Millicent gains the upper hand and wounds Terakomari multiple times. However, Terakomari’s resolve strengthens, driven by her desire to protect her maid Villhaze, who is being held hostage. Villhaze manages to send Terakomari a telepathic message, encouraging her to stand her ground.

At the climax of the battle, Terakomari succeeds in activating her core implosion ability, turning the tide against Millicent. The episode reveals that Terakomari first used this ability at the age of three but was hypnotized to forget it, shielding her from the trauma.

Terakomari defeats Millicent but spares her life, giving her a chance at redemption. Millicent is arrested, and the episode ends with an intimate moment between Terakomari and Villhaze. Terakomari confirms that Villhaze will remain her maid, and both look forward to their future together.