Koki Yukishiro's Power

Taking Aira's advice, Koki appeals to the pygmies for help locating Murakami and apologizes for treating them rudely before. Murakami, meanwhile, steps off his exercise bike to corner Adachi, who stands awkwardly in a skimpy bunny outfit; displeased by her flat mood, he warns her to perk up if she wants his money to keep covering her mother's care, oblivious to the talisman hidden behind her back. The pygmies report that Murakami is no longer at the gym, and Koki relays this to Aira.

Recognizing the deception, Aira urges Rin to keep her song going while they hold off the Severed Head Dribblers. Feeling useless as she watches the two fight, Koki is stunned when the pygmies present a piano they have built. Mai, Aira, and Rin coax her to play, hoping it strengthens Rin. Sitting down, Koki freezes as her mother's old lessons resurface and her fingers stumble. Aira pushes her to improvise, confessing that she herself once turned to the piano for comfort after losing her own mother, and that she had marveled at Koki's earlier recitals. Heartened, Koki tries once more and finds a melody. Mai guesses the music neither boosts power nor commands the pygmies but does something else entirely, as a thick cloud of flies gathers across Kamigoe City.

Adachi waits in Murakami's apartment in a revealing suit; aware she is straining to care for her ailing mother, he nearly assaults her. The pygmies fail to find Murakami, leaving Aira and Rin both worn down. The pygmies craft a piano for Koki, but her trauma makes playing hard. Aira confides that she once took up the instrument for comfort after her own mother died and that she had admired Koki's performances. Koki finally plays a sorrowful tune and triggers her power, summoning a huge swarm of flies across Kamigoe City.

Appearing March 18, 2025 in Volume 22 of the Ultimate Yokai Saga, this Kozuka Knives Arc chapter awakens Koki's latent ability through the pygmies' piano, bridging her grief over her mother to the fly swarm that spreads across Kamigoe City. Alice Yukishiro appears in flashback.