KonoSuba Releases 10th Anniversary Autumn Audio Drama “Darkness Happy Halloween: Sanma no Kisetsu”

KonoSuba: God's Blessing on This Wonderful World! has continued its 10th anniversary celebration with a new autumn audio drama. Part 1 of “Darkness Happy Halloween: Sanma no Kisetsu” began streaming on YouTube on October 16, 2026.

The original story is once again written by series creator Natsume Akatsuki. Following earlier seasonal installments, the autumn episode sends Kazuma and his party into another distinctly Axel-style disaster—this time combining Halloween with an inexplicable saury harvest festival.

Quick Summary

• Franchise: KonoSuba: God's Blessing on This Wonderful World!
• Japanese title: この素晴らしい世界に祝福を！
• Common name: KonoSuba / このすば
• Format: audio drama
• Project: KonoSuba Anime 10th Anniversary
• Seasonal installment: Autumn
• Title: Darkness Happy Halloween: Sanma no Kisetsu
• Japanese title: ダークネス・ハッピーハロウィン～秋刀魚の季節～
• Release format: three parts
• Part 1: released October 16, 2026
• Part 2: coming later
• Part 3: coming later
• Platform: YouTube
• Channel: KADOKAWAanime
• Original story: Natsume Akatsuki
• Status: newly written anniversary story
• Project concept: seasonal stories covering winter, spring, summer and autumn
• Primary setting: Axel
• Episode theme: Halloween
• Episode theme: autumn festival
• Episode theme: saury harvest
• Kazuma: returns
• Aqua: returns
• Megumin: returns
• Darkness: returns
• Luna: returns
• Chris: joins the story
• Adventurers: also appear
• Opening premise: Kazuma relaxes at the mansion on a peaceful autumn day
• Megumin: suddenly makes a fuss about Halloween Night
• Megumin: rushes out of the mansion
• Kazuma's group: visits the Adventurers Guild after hearing about an autumn event
• Luna: announces a saury harvest festival
• Key requirement: high Luck
• Important ability: Steal
• Chris: joins because of those requirements
• Tone: comedy fantasy
• Focus: another chaotic everyday adventure in Axel
• Kazuma: Jun Fukushima
• Aqua: Sora Amamiya
• Megumin: Rie Takahashi
• Darkness: Ai Kayano
• Luna: Sayuri Hara
• Ruffian: Tetsu Inada
• Chris: Ayaka Suwa
• Adventurers: Sarah Emi Bridcutt
• Adventurers: Mitsuhiro Sakamaki
• Adventurers: Hitomi Nabatame
• Original concept / story: Natsume Akatsuki
• Script: Satoko Sekine
• Sound director: Miwa Iwanami
• Sound effects: Yasumasa Koyama
• Recording: Takayuki Yamaguchi
• Sound production: HALF H・P STUDIO
• Video production: X-ONE
• Special illustration: newly drawn anime artwork released with the announcement
• Anime premiere: January 13, 2016
• Anniversary: 10th anniversary in 2026
• Next TV season: KonoSuba Season 4 scheduled for 2027
• Current autumn drama status: Part 1 available

Autumn Audio Drama and Special Illustration

Halloween Meets a Saury Harvest Festival

The premise immediately embraces KonoSuba's usual logic. Kazuma is spending a peaceful autumn day at the mansion when Megumin suddenly starts shouting about Halloween Night and rushes outside.

After hearing about an autumn event, the party visits the guild, where Luna announces something considerably stranger: a saury harvest festival requiring participants with unusually high Luck and the Steal skill.

Chris Joins the Harvest

The need for high Luck brings Chris into the event.

That setup leads directly into the episode's central joke. Kazuma is less concerned with monsters or a dangerous quest than with the absurdity of being expected to “dig saury out of a field” in another world.

A New Story Written by Natsume Akatsuki

The anniversary audio dramas are not retellings of existing anime episodes. The official project describes them as new original stories written by Natsume Akatsuki, following Kazuma and his companions through different seasons in Axel.

The autumn story also follows the established three-part release format, meaning the October 16 premiere only begins “Darkness Happy Halloween: Sanma no Kisetsu.”

The Main Cast Returns

Jun Fukushima, Sora Amamiya, Rie Takahashi and Ai Kayano return as Kazuma, Aqua, Megumin and Darkness.

The episode also features Sayuri Hara as Luna, Ayaka Suwa as Chris and Tetsu Inada as the Ruffian, with Sarah Emi Bridcutt, Mitsuhiro Sakamaki and Hitomi Nabatame voicing adventurers.

Why This Matters

1) Natsume Akatsuki is writing new anniversary material

The project adds original KonoSuba stories instead of simply revisiting scenes from the TV anime.

2) The autumn premise is unmistakably KonoSuba

Halloween, saury, Steal and a harvest festival somehow become part of the same Axel quest.

3) It adds new material before Season 4

KonoSuba Season 4 is scheduled for 2027, while the anniversary projects continue providing new content throughout 2026.

KonoSuba and Autumn Audio Drama Information

For now, the additional important information currently known includes:

• the audio drama project celebrates the KonoSuba anime's 10th anniversary
• the first TV anime began broadcasting January 13, 2016
• the anniversary project continues throughout 2026
• the audio dramas feature original stories by Natsume Akatsuki
• the overall concept follows Kazuma and his friends across four seasons
• distribution takes place through YouTube
• the autumn episode is titled Darkness Happy Halloween: Sanma no Kisetsu
• its Japanese title is ダークネス・ハッピーハロウィン～秋刀魚の季節～
• the autumn episode is divided into three parts
• Part 1 became available October 16, 2026
• the middle and final installments will follow
• exact dates for the remaining two parts were not included in the initial announcement
• a newly drawn anime special illustration was also released
• the story takes place around Axel
• the episode begins on a peaceful autumn day
• Kazuma is relaxing at the mansion
• Megumin talks about Halloween Night
• Megumin rushes out of the mansion
• Kazuma and the party hear about an autumn event
• they visit the Adventurers Guild
• Luna announces a saury harvest festival
• the festival requires someone with high Luck
• Steal is also important to the plan
• Chris eventually joins the group
• Kazuma questions why anyone has to dig saury out of a field
• comedy remains the central tone
• Jun Fukushima returns as Kazuma
• Sora Amamiya returns as Aqua
• Rie Takahashi returns as Megumin
• Ai Kayano returns as Darkness
• Sayuri Hara voices Luna
• Tetsu Inada voices the Ruffian
• Ayaka Suwa voices Chris
• Sarah Emi Bridcutt voices one of the adventurers
• Mitsuhiro Sakamaki voices one of the adventurers
• Hitomi Nabatame voices one of the adventurers
• Natsume Akatsuki handles the original concept/story
• Satoko Sekine handles the script
• Miwa Iwanami serves as sound director
• Yasumasa Koyama handles sound effects
• Takayuki Yamaguchi handles recording
• HALF H・P STUDIO handles sound production
• X-ONE handles video production
• the audio drama is one of several anniversary projects
• the anniversary campaign also includes the Colorful event
• it also includes the Cheerful exhibition
• KonoSuba Season 4 has already been announced
• Season 4 is scheduled for 2027
• the anniversary audio dramas are separate from Season 4's main story
• anime information is available through the Official Website
• anniversary information is available through the KonoSuba 10th Anniversary Website
• audio drama information is available through the Official Audio Drama Page
• official updates are available through Official X
• the premiere announcement is available through the Exact Official X Post
• the three-part format and special illustration were announced through the Official Pre-Premiere Post
• official videos are published through KADOKAWAanime

Closing

“Darkness Happy Halloween: Sanma no Kisetsu” brings KonoSuba's 10th anniversary audio drama project into autumn with another original Natsume Akatsuki story, this time built around an absurd saury harvest in Axel.

Part 1 is now available, with the middle and final chapters still to come. Meanwhile, the main TV anime is also preparing for KonoSuba Season 4 in 2027.

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