Sachiko Uguisu’s Kaikai Gigigigigi Manga Ends
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Sachiko Uguisu’s horror-comedy manga has now ended in Japan. Its final chapter arrived on Comic Action on October 28, after launching in April 2025.
Sachiko Uguisu’s horror-comedy manga Kaikai Gigigigigi has ended in Japan, with its final chapter released on Tuesday, October 28, through Futabasha’s Comic Action platform. Launched in April 2025, the series follows three high school students investigating the K-Zone, a restricted area of Kaminari City linked to supernatural incidents. Its conclusion brings a little over a year and a half of digital serialization to a close and sets up the collection of the remaining story in a third volume.
The final chapter arrives on Comic Action
Comic Action published the manga’s final installment in Japan on October 28, according to Anime News Network, which cited Futabasha’s platform as its source. The chapter closes the story serialized through Web Action/Comic Action, where Uguisu began the series in April 2025. The publisher’s official Comic Action page hosts the chapter and the manga’s series information.
The announcement concerns the manga’s ending; it does not announce an anime adaptation or another project. The confirmed news is that the Japanese serialization has concluded. That does not mean the collected books disappear from circulation: the already released chapters remain part of the digital edition, while the publisher’s print compilations are a separate part of the release schedule.
Three students and a forbidden zone
The premise is set in Kaminari City, where the K-Zone is closed to the public. Unexplained phenomena are associated with the area, and three students—Chuuta, Kirimai, and Kawanakajima—decide to investigate what lies behind the restriction. Their curiosity repeatedly puts them face to face with creatures, local legends, and situations that mix supernatural danger with comedy.
The setup draws on the familiar shape of a school mystery, but the K-Zone gives the story a recurring place from which it can change scale and tone. One episode can turn an urban legend into a direct threat; another can use the characters’ over-the-top reactions to release some of the tension. Futabasha’s own description of the second volume classifies the series as a blend of mystery, horror, and comedy for young adult readers.
Official descriptions also point to a changing succession of encounters, including zombies, kappa, mummies, killers, and other uncanny beings. The plot is not reduced to a single monster or one isolated mystery. The investigation of the K-Zone provides continuity, while each case presents a different problem for the group. That episodic framework allowed Uguisu to vary the creatures and settings across the manga’s run.
Serialization began in April 2025
Uguisu launched Kaikai Gigigigigi on Futabasha’s platform in April 2025. The first collected print volume reached Japanese bookstores in September of that year, and the second was released on May 14, 2026. Futabasha’s description of volume two highlights Gasha, the leader of a secret society, and her attempt to use Chuuta’s special connection to the K-Zone, alongside new supernatural cases.
In June, the author had already indicated that the series was expected to conclude with its third volume. In a message to readers, Uguisu said she wanted to keep drawing the manga, but at the time expected to finish after a few more chapters. “I’ll enjoy drawing it all the way to the end,” she wrote while asking readers to follow the final stretch. The conclusion now confirms the endpoint she had anticipated, although the precise release date for the third book should be checked against the publisher’s future announcements.
“I’ll enjoy drawing it all the way to the end.” — Sachiko Uguisu, in a message to readers.
This history distinguishes two milestones: the final chapter’s digital publication and the later arrival of the collected print edition. The second volume gathered previously serialized material; the final book is expected to collect the remaining chapters, but its page count, bonus material, and final schedule depend on a publisher announcement. Futabasha’s official volume two listing confirms the creator, imprint, genre, and release date.
The ending closes the K-Zone story
The conclusion turns the K-Zone from an ongoing promise of mystery into a setting readers can now approach as part of a completed work. For readers who followed the series from its debut, the news confirms that Chuuta, Kirimai, and Kawanakajima will not return in new regular chapters. For newcomers, the ending also offers a clear starting point: they can begin with volume one and follow the sequence knowing that the serialized story has a published conclusion.
Futabasha has not publicly detailed every event in the ending. Comic Action confirmed that the final chapter was published, but the available materials do not reveal each character’s fate or explain how the central mysteries are resolved. Keeping that distinction clear avoids turning an announcement about the finale into a plot summary that readers have not yet encountered.
The publication timeline is compact: digital debut in April 2025, first collected volume that same year, second volume in May 2026, and final chapter in October. The format gave Uguisu room to build a series of cases around a shared location without making every episode repeat the same threat. The K-Zone brought the cast together, supported shifts in mood, and gave the manga a recognizable identity within Japanese horror comedy.
Where to follow the collected editions
Digital reading and chapter details remain available on the official Comic Action page. Futabasha also maintains bibliographic information for the collected volumes. The second book was released in B6 format under the Action Comics imprint and continues the conflict surrounding the K-Zone. Details about the third and final volume should be confirmed when the publisher posts its listing.
The finale joins other manga coverage at O Santuário Geek’s manga section. Readers comparing how different creators approach a series ending can also see our report on the conclusion of Kimi to Issho ni Kayoitai, scheduled for November. For Uguisu’s manga, the central fact is straightforward: the Japanese publication of Kaikai Gigigigigi ended with the chapter released on October 28.
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