
Summary
- Acrobatic Silky’s brave sacrifice enables Shiratori to join the group of Momo and Okarun.
- As Aira expresses her feelings, Momo’s insecurities rise, coinciding with an attack from the Serpoians.
- Through collaboration, Momo, Okarun, and Aira successfully overcome the Serpoians in a gripping confrontation.
After their intense battle with Acrobatic Silky, the character sacrifices herself to rejuvenate Aira, leading to her own demise. This poignant moment allows Shiratori to join the growing team of Momo and Okarun. As they adapt to new dynamics and team cohesion, they remain unaware of lurking dangers as sinister forces prepare to ambush them. The unfolding Serpo arc heightens the tension as they confront formidable enemies determined to seize their objectives.
Momo and Okarun Face a Misunderstanding
Aira’s Confession Unsettles Momo

- Arc: The Serpo Arc
- Manga Chapters: 18-27
- Anime Episodes: 8-10
In the aftermath of a surprising incident at school, Momo, Okarun, and Aira return to the Ayase household. With Ken having recovered his kintama, Momo attempts to apologize to Aira for an earlier mishap involving a washbasin but is met with Aira’s assertion of being a demon, complicating the situation. As Momo and Okarun navigate their evolving relationship, misunderstandings begin to surface.
The following day, Okarun informs Momo that he is too busy to assist her in searching for his other kintama, sparking Momo’s suspicions. These feelings of doubt are exacerbated when Miko suggests he could be untruthful due to a romantic interest in another girl. Although Momo initially dismisses these thoughts, they linger in the back of her mind.
Meanwhile, Okarun finds himself training alone when Aira approaches him, having developed feelings for him. In an awkward moment, after confessing her feelings and attempting a kiss, Okarun unintentionally falls over Shiratori, creating a scene witnessed by Momo, who fears her anxieties are becoming reality.
An Unexpected Attack by the Serpoians
Ambush Encounter with Aliens

Following a brief argument, Momo retreats to class, only to realize she’s been transported to an empty void resembling her previous battle with the Flatwoods Monster. Venture outside the classroom, she is startled to encounter Nessie. Meanwhile, Okarun finds Aira, who theorizes that Momo might be responsible for their current predicament.
As Okarun recounts his last encounter with the void to Aira, they are suddenly attacked by the Dover Demon, driven by the Serpoians. He prepares to combat the alien threat, but the Serpoians quickly subdue him with their psychokinetic powers, revealing their sinister interest in Okarun’s yokai abilities.
In a surprising turn, Aira taps into Acrobatic Silky’s powers, transforming and providing a much-needed distraction. Although she proves her agility against the Dover Demon, the Serpoians quickly regain control and confine her again, leaving Okarun and Aira at their mercy.
Momo, Aira, and Okarun Strike Back
Teamwork Triumphs Over Serpoian Tactics

The Serpoians previously sent Nessie to deter Momo, but with her arrival on the scene, their tactics began to unravel. As she uses her power ineffectively against the Serpoians, they shift strategy, further enhancing the Dover Demon’s abilities and overwhelming Okarun and his allies.
Momo and Okarun display remarkable courage against the amplified Dover Demon while trying to save Aira from being engulfed in chaos. They unite to confront the increasingly powerful threat, which merges these creatures into a monstrous entity capable of stunning attacks.
At a critical moment, Momo devises a clever plan. She manipulates the water levels to counter the water-based attacks of their adversary, resulting in a fierce confrontation where she narrowly escapes drowning but is saved by Okarun and Aira, who fight back against their formidable enemy.
Okarun’s Theory and Meaningful Reconciliations
Aira Stands Up for Momo; Okarun Clarifies

In the aftermath of the battle, the trio finds themselves in an awkward situation requiring an explanation to their classmates and the school nurse. Momo contemplates the Serpoians’ desire for yokai powers, prompting Okarun to propose a theory: advanced alien technology has consistently failed against yokai, suggesting that these creatures serve as Earth’s protective barrier.
Okarun takes the opportunity to clarify the misunderstanding with Aira, dispelling any lingering tension. Meanwhile, Aira returns to class, encountering rumors sparked by her previous comments about Momo. Sensing her errors, she bravely defends Momo, urging her classmates to reconsider their thoughts.
The Dover Demon’s Journey Home
Momo and Friends Save Their Rival

The Serpoians initially enlisted the Dover Demon to capture Okarun. However, upon realizing their failure, they abandon him, leaving the weakened alien at the mercy of Momo and Aira, who tend to his injuries. They transport him to the Ayase household, where their team cares for him until he awakens, filled with gratitude.
The Dover Demon shares his plight: he requires funds for his son’s medical needs, invoking empathy in Aira and Momo, who ultimately provide him with the care needed for a sustainable future. As their concern for him results in a newfound alliance, he promises his loyalty and assistance whenever they may require it in the future, securing a supportive friendship.
As the group witnesses the Dover Demon ascend into the starry night, they feel a strong bond solidified by understanding and kindness, marking an important chapter in their intertwined journeys.
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