San and Mayu attend an all-girls school on a warm and tranquil island. When war reaches their shores, they are ordered to help nurse the wounded in a military hospital hidden away in a cave. Amidst escalating death and brutality, the friends struggle to find solace in their fragile lives.Based on the manga by Machiko Kyo, cocoon - One Summer of Girlhood is the debut feature from Yukimitsu Ina and animation studio SASAYURI, founded by former Studio Ghibli animator Hitomi Tateno. The project brings together legendary veteran animators like Akihiko Yamashita and Shinji Otsuka, known for their work on PRINCESS MONONOKE and THE BOY AND THE HERON, with a new, young generation of animating talent. Featuring a stirring score from kensuke ushio (A Silent Voice, Chainsaw Man), the film is a devastating yet beautiful plea for peace.As a bonus for theatrical screenings, fans of the legendary composer kensuke ushio will be able to enjoy a special behind-the-scenes look at his process composing the score.

GENRE: Animation
MPAA RATING: No Rating
RUN TIME: 1h 25m
RELEASE DATE: September 04, 2026
STARRING: Maria Abo, Chinatsu Akasaki, Akane Amasawa, Izumi Aoyagi, Yumi Arai
DIRECTOR(S): Yukimitsu Ina
PRODUCER(S):
WRITER(S): Taku Kishimoto, Yukimitsu Ina
STUDIO: GKIDS