Acrobatic Silky Arc

Spanning chapters 9 through 17 across volumes 2 and 3, this is the manga's second arc and the saga's second leg, sitting between the Turbo Granny Arc and the Serpo Arc. The anime adapts it over episodes 5 to 7 of season one. Its plot pushes Momo and Okarun to recover his missing kintama, scattered when Turbo Granny fell, and brings two newcomers forward: the yokai Acrobatic Silky and a classmate, Aira Shiratori, who happens to be carrying one of the lost orbs without knowing it.

A friendly walk to homeroom leaves the pair wanting more conversation, yet their separate lunchtime searches keep missing, each one quietly deciding the other wants distance. When they finally collide in a hallway, Momo's friends read the accidental crash as a kiss, a misread that triggers a spat. Soon after, Okarun glances down in a bathroom and realizes, with dread, that a kintama is gone from him.

Later Momo catches Aira boasting about leading Okarun on, so she drops a basin onto the girl's head through her powers. At the Ayase home Seiko inspects Okarun and senses an intruder lodged in his body. She lays out a charm, a beckoning cat figurine, a basin of water, and a paper fan, then thwacks him to coax the presence loose; the cat statue suddenly bolts to life. It turns out to be Turbo Granny, who burrowed into Okarun just before her exorcism wrapped up, plotting payback. Powerless now, she promises the kintama's whereabouts only if Okarun murders Momo and Seiko, which makes him snap. Momo instead cuts a deal: locate the orbs together and her powers return. Turbo Granny agrees but confesses she misplaced them when she lost, and a sweep finds nothing. She suspects a spirit or yokai was lured by the golden energy wrapping the orbs.

Aira, having pocketed one orb, decides it is a sacred ball anointing her humanity's rescuer. She baits Momo to a derelict warehouse, where her crew zip-ties Momo and Aira fumbles an exorcism with cross and bible. Breaking free, Momo spots the kintama in Aira's hand just as the woman Turbo Granny warned about materializes, grabs Aira, and announces she is the girl's mother. This yokai, Acrobatic Silky, twists and tumbles so nimbly that even Okarun's transformed form cannot land a hit. She gulps down Okarun, then Aira, then Momo, sobbing as she hunts for her child. Inside, Momo torches the swallowed hair using Aira's cross lighter, forcing the yokai to spit all three out.

Scorched into a perm, Acrobatic Silky's hair snags on everything as she pursues Okarun around the warehouse, precisely the trap Momo intended. Momo locks the yokai's feet while Okarun rockets himself into her to finish the takedown. Afterward the group learns Aira truly perished inside the yokai's stomach. To undo it, Acrobatic Silky surrenders her own aura, tearing away her mouth as a pledge she will not feed again. Channeling the exchange, Momo glimpses the yokai's heartbreaking history. Aira revives, but the now-auraless Acrobatic Silky starts dissolving. Stirred by sympathy, Aira holds her close and names her mother, easing the yokai gently into the next world as she wishes a softer world for herself and her real daughter.

The arc debuts Aira Shiratori alongside Anzu and Tsubame, with Aira becoming the duo's first school ally; Ririna also slips in here, unnamed until a later arc. Touching the kintama gifts Aira spirit sight and a chuunibyou phase that wears off after the Evil Eye Arc, and her resurrection saddles her with Acrobatic Silky's hair powers. Turbo Granny moves in as the Ayase household's first lodger, while Okarun retains her power and dreams up his trademark self-propelled strike. Seiko's name surfaces, and Okarun's crush on Momo begins once a classmate calls her cute. The chapter also seeds lore: an ordinary human swallowed by a yokai dies; an aura functions like a battery keeping the heart alive; a yokai drained of aura crumbles to nothing and can be wiped from all memory while regrets remain; and only a regret-free yokai reaches Nirvana. Momo, for her part, finds she can pass auras along and peer into others' memories.