Hachigatsu Sanjuuichinichi no Long Summer Gets TV Anime and TV Drama Adaptations, Shaft Produces Anime

Ikkado Ito's manga Hachigatsu Sanjuuichinichi no Long Summer (8月31日のロングサマー) is officially receiving two screen adaptations. Kodansha announced on August 31, 2026 that the series will be adapted into both a TV anime and TV drama.

For the anime, Shaft has been confirmed for animation production. An Ultra Teaser Visual accompanied the initial reveal, while the premiere date, cast, director and other principal staff remain unannounced.

Quick Summary

• Title: Hachigatsu Sanjuuichinichi no Long Summer
• Japanese title: 8月31日のロングサマー
• Creator: Ikkado Ito
• Source format: manga
• Core concept: youth time-loop comedy and romance
• Publisher: Kodansha
• Magazine: Morning
• Manga status: ongoing
• Serialization began: March 30, 2023
• Adaptation announcement: August 31, 2026
• First adaptation: TV anime
• Second adaptation: TV drama
• Announcement format: double screen adaptation
• Anime studio: Shaft
• First anime material: Ultra Teaser Visual
• Main protagonist: Suzuki
• Main heroine: Takagi
• Core setting: an endlessly repeating August 31
• Loop condition: Suzuki and Takagi retain memories from previous loops
• Central premise: the pair investigate why the final day of summer vacation keeps repeating
• Romance element: the cause may be tied to something Suzuki failed to accomplish over summer vacation
• Published volumes: 13 as of August 31, 2026
• Latest volume: Volume 13
• Volume 13 release: August 21, 2026
• Volume 13 price: ¥792 including tax
• Volume 13 ISBN: 9784065447314
• Volume 13 length: 192 pages
• Format: B6
• Label: Morning KC
• Volume 13 digital edition: available
• Special chapter: 8月31日限定特別編
• Special chapter date: August 31, 2026
• Platform: Comic DAYS
• Special chapter viewpoint: Takagi
• Concept: Chapter 1 retold from Takagi's perspective
• Availability: through 11:59 p.m. JST on August 31
• Additional campaign: content covering up to four volumes available free
• Campaign period: through September 7, 2026
• TV anime premiere: unannounced
• TV anime cast: unannounced
• Anime director: unannounced
• Series composition: unannounced
• Anime character design: unannounced
• Anime music: unannounced
• Anime broadcaster: unannounced
• TV drama premiere: unannounced
• TV drama cast: unannounced
• TV drama staff: unannounced
• TV drama network: unannounced

Adaptation Announcements and Ultra Teaser Visual

TV Anime and TV Drama Announced Together

Kodansha chose the date most closely associated with the manga itself for the reveal. On August 31, 2026, the official account announced both a TV anime and a TV drama adaptation.

It is one of the series' largest expansions since serialization began in Morning in 2023. The projects were announced simultaneously, but there is currently no confirmation that they will premiere during the same period.

Shaft Is Producing the Anime

The most significant production detail confirmed for the anime is Shaft as the animation studio.

The studio is known for projects including the Puella Magi Madoka Magica and Monogatari series. The initial announcement does not yet identify the director, character designer, series composer, composer, cast or broadcaster.

Suzuki and Takagi Are Trapped on August 31

The manga follows high school students Suzuki and Takagi, who meet while experiencing August 31 over and over again.

Unlike everyone around them, they retain memories across the loops. The suspected cause eventually points toward something Suzuki failed to accomplish during summer vacation, directly tying the mystery to the pair's developing romantic relationship.

Ultra Teaser Visual Is the First Anime Material

Kodansha unveiled an Ultra Teaser Visual alongside the TV anime announcement.

No teaser PV, trailer or animated footage has been released as part of the initial reveal. The anime's moving character designs, voice performances, music and broader visual direction therefore remain unseen.

Manga Has Reached Volume 13

The adaptations were announced only ten days after Volume 13 was released on August 21, 2026.

The volume costs ¥792 including tax, contains 192 pages, uses a B6 format and is published under the Morning KC label. A digital edition launched on the same date.

Comic DAYS Celebrates August 31 With a Special Chapter

Comic DAYS also released the recurring August 31 Limited Special Chapter on the same date.

The chapter retells Chapter 1 from Takagi's perspective and remains available only through 11:59 p.m. JST on August 31. A separate adaptation campaign also makes content covering up to four collected volumes available free through September 7, 2026.

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Why This Matters

1) Two adaptations were announced at once

Hachigatsu Sanjuuichinichi no Long Summer is receiving both a TV anime and TV drama rather than a single adaptation.

2) Shaft is producing the anime

Shaft's involvement immediately provides a major production identity for the anime project.

3) The announcement date mirrors the premise

The double adaptation was revealed on August 31, the exact date endlessly repeated in the manga.

4) The source manga remains active with 13 volumes

The adaptations begin while the manga is still ongoing and only days after Volume 13 was published.

Manga, Anime and Drama Information

For now, the additional important information currently known includes:

• Hachigatsu Sanjuuichinichi no Long Summer is a manga by Ikkado Ito
• serialization began in Morning in March 2023
• the manga remains ongoing at the time of the adaptation announcement
• the TV anime and TV drama were announced together on August 31, 2026
• Shaft is handling animation production for the TV anime
• an Ultra Teaser Visual has been released as the anime's first promotional artwork
• no anime teaser PV or trailer has been announced
• the TV anime premiere date remains unannounced
• the anime cast remains unannounced
• the director and principal staff beyond Shaft have not yet been detailed
• the anime character designer remains unannounced
• the anime music staff remains unannounced
• the anime broadcaster and streaming platforms remain unannounced
• the TV drama premiere date remains unannounced
• the drama cast remains unannounced
• the drama director, screenwriter and principal production staff remain unannounced
• the drama's network or distribution service has not yet been detailed
• the manga follows Suzuki and Takagi as they repeatedly experience August 31
• Suzuki and Takagi retain memories across previous loops
• Kodansha describes the work as a youth time-loop comedy that directly engages with romance
• 13 collected volumes were available as of August 31, 2026
• Volume 13 was released on August 21, 2026
• the print edition uses a B6 format and contains 192 pages
• Volume 13 officially costs ¥792 including tax
• its ISBN is 9784065447314
• a digital edition of Volume 13 is also available
• Comic DAYS opened the August 31 Limited Special Chapter on August 31
• the special presents Chapter 1 from Takagi's viewpoint
• the special chapter is available only through 11:59 p.m. JST on August 31
• the adaptation campaign makes content covering four volumes free through September 7
• manga information is available through the Hachigatsu Sanjuuichinichi no Long Summer Morning Official Page
• updates are available through Hachigatsu Sanjuuichinichi no Long Summer Official X
• the adaptation announcement is available through the Official X Announcement
• the creator announcement is available through the Ikkado Ito Official X Post
• the special chapter and announcement teaser are available through this Official X Post
• the limited special chapter is available through Comic DAYS
• Volume 13 information is available through the Kodansha Volume 13 Page

Closing

The simultaneous TV anime and TV drama announcements make August 31, 2026 another major milestone for Hachigatsu Sanjuuichinichi no Long Summer. Shaft is already confirmed for animation production, while the Ultra Teaser Visual provides the anime's first promotional material.

Both adaptations remain at an early stage. Their premiere dates, casts, anime staff beyond Shaft, drama production team, broadcasters, distribution platforms and first animated footage are still awaiting future announcements.