The cocoon – One Summer of Girlhood trailer for the English dub landed on 18 August 2026, when GKIDS opened ticket sales. The 1:17 spot is the first time Western audiences have heard the dub cast for this wartime anime, adapted from Machiko Kyō’s manga. It reaches North American theatres on 4 September 2026.
Trailer via GKIDS Films on YouTube.
This one needs context more than most trailers do. Here is what the film is, what the trailer actually adds, and the real history sitting underneath it.
cocoon – One Summer of Girlhood at a glance
| Detail | Confirmed |
|---|---|
| Video | cocoon – One Summer of Girlhood | Official English Trailer |
| Channel | GKIDS Films (official) |
| Published | 18 August 2026 |
| Runtime | 1 minute 17 seconds |
| US theatrical release | 4 September 2026 (GKIDS) |
| Formats | Japanese with English subtitles, and English dub |
| Film runtime | 60 minutes |
| Director | Yukimitsu Ina (feature debut) |
| Screenplay | Yukimitsu Ina and Taku Kishimoto |
| Studio | SASAYURI |
| Animation producer | Hitomi Tateno (ex-Studio Ghibli) |
| Music | kensuke ushio |
| Japanese cast | Hikari Mitsushima (Mayu), Marika Itō (San) |
| English dub cast | Lauren Kong (San), Anjali Kunapaneni (Mayu) |
| Source | cocoon by Machiko Kyō, serialised 2009–2010 |
What the trailer shows
Reporting on the spot is consistent on its shape. Screen Rant describes a trailer built on contrast: San and Mayu begin in an idyllic island setting, warm and ordinary, surrounded by school life, before the war arrives and the film moves into a cave hospital full of the wounded. The tagline carried in the coverage is “You have to make decisions for yourselves.”
That is as far as the sourcing goes, so that is as far as we will go. No outlet has published a shot list or timestamps for this trailer, and we are not going to invent either. If you want the specifics, the embed is right above — it is 77 seconds.
The manga underneath it
cocoon is a single-volume manga by Machiko Kyō, serialised in Akita Shoten’s Elegance Eve from March 2009 to May 2010, per Wikipedia. A single volume, finished fifteen years before the anime caught up with it.
Here is the practical detail most trailer coverage leaves out: you can read the source right now. VIZ Media published the English edition on 16 June 2026, and the book was nominated for Best One-Shot Manga at the 3rd American Manga Awards. Two and a half months ahead of the film is an unusually generous window for a manga adaptation.
The real history: the Himeyuri students
The film is not inventing its premise. Per Wikipedia’s account of the Himeyuri students, 222 students and 18 teachers from the First Okinawa Girls’ High School and the Okinawa Women’s Normal School were mobilised into an army nursing unit on 23 March 1945 and sent to the Haebaru field hospital — a network of caves. The students were aged between 13 and 19.
The detail that matters most, and the one a 77-second trailer cannot carry: the unit was handed a dissolution order on 18 June 1945, which released the girls into an active battlefield rather than to safety. Most of the deaths came after that order. In total, 211 students and 16 teachers were killed.
If the film follows its source, the cave sequences the trailer gestures at are the middle of the story, not the end of it.
The Ghibli connection is real, but read it carefully
Every write-up leads with Ghibli, and the credits do earn it. SASAYURI was founded by Hitomi Tateno, a Ghibli veteran whose credits include My Neighbor Totoro and Howl’s Moving Castle, and who serves as animation producer here. Akihiko Yamashita (Spirited Away, The Boy and the Heron) and Shinji Ōtsuka (Kiki’s Delivery Service, Princess Mononoke) are on the animation staff, per Screen Rant.
But “from Ghibli veterans” is marketing shorthand, not a genre promise — and Ghibli’s own catalogue is the proof. These two films went out from the same studio on the same double bill in April 1988:
A Ghibli credit spans both of those. The staff overlap on cocoon tells you about the draughtsmanship; it tells you nothing about the tone. This is a 60-minute NHK production about teenage girls in a wartime field hospital. Set your expectations at the right end of that shelf.
Worth noting too: composer kensuke ushio (A Silent Voice, Chainsaw Man, Dandadan) and co-writer Taku Kishimoto (Haikyu!!, SAKAMOTO DAYS) are both well outside the Ghibli lineage. The staff list is more interesting than the headline.
What’s new here, precisely
GKIDS already released an English-subtitled trailer on 16 July 2026, per Anime News Network. Against that, the delta is narrow and specific:
- The English dub, for the first time. Lauren Kong voices San and Anjali Kunapaneni voices Mayu, with Anne Yatco, Triya Leong, Alyssa Poon, Abby Pasion, Maya Aoki Tuttle, Risa Mei, Kimoy Lee and Michelle Wong in support.
- Tickets are on sale. That is the commercial reason the spot exists.
- Confirmation of both formats. Subtitled and dubbed screenings are running, so the choice is yours rather than your local theatre’s.
What has not changed: the release date, the staff, the premise. If you watched the July trailer, the new information here is audio.
The sub-versus-dub question is unusually loaded on this one
We generally think the sub versus dub argument is overcooked — both are mediated, in different directions. This film is the case where it genuinely deserves a thought.
The Japanese track carries an Okinawan wartime story in the language it happened in, and the regional specificity of that is part of the text rather than decoration. Against that, a dub is usually the only practical route for viewers who cannot read subtitles at speed — younger audiences, and blind and partially sighted viewers — and this is a dialogue-heavy hour. Both choices are defensible. Neither is the “correct” one, and the film is playing in both formats precisely so you do not have to argue about it.
What the trailer doesn’t show
The usual caveat: we are reading coverage from outlets that watched it, and none published a full inventory, so silence in the reporting is not proof of absence. That said, nothing in the write-ups mentions:
- The dissolution order, or anything from the final act.
- Explicit combat footage — the emphasis in every description is the hospital and the wounded, not the battle.
- Any US theatre list. GKIDS has said “select theatres” without publishing locations.
- Any rating.
For a film that runs an hour, holding the final act back is the right instinct.
Frequently Asked Questions
When does cocoon – One Summer of Girlhood come out in the US?
GKIDS releases it in select North American theatres from 4 September 2026, in Japanese with English subtitles and in an English dub. A home video release is planned to follow.
Is cocoon based on a manga?
Yes. It adapts Machiko Kyo’s single-volume manga cocoon, serialised in Akita Shoten’s Elegance Eve from March 2009 to May 2010. VIZ Media published the English edition on 16 June 2026.
Is cocoon a Studio Ghibli film?
No. It is made by SASAYURI, a studio founded by former Ghibli animator Hitomi Tateno, and several Ghibli veterans are on the animation staff. Ghibli itself is not involved in the production.
Who are the Himeyuri students?
A nursing unit of 222 students and 18 teachers from two Okinawan girls’ schools, mobilised by the Imperial Japanese Army on 23 March 1945 during the Battle of Okinawa. 211 students and 16 teachers were killed. cocoon draws on their history.
How long is the film?
60 minutes. It first aired on NHK BS in March 2025 and on NHK General in August 2025 before this North American theatrical release.
More anime on the site: our guide to watching the Studio Ghibli films in order is a decent companion if the staff credits sent you looking, and our sub versus dub explainer digs into why the dub debate is messier than either camp admits. If feature-length anime drama is your lane, our Makoto Shinkai ranking is a good next stop.
Sources: GKIDS Films on YouTube, Anime News Network, the GKIDS press release, Screen Rant and Variety.
