is a Japanese manga series written and illustrated by Machiko Kyà  (). It was serialized in Akita Shoten's manga magazine Elegance Eve from March 2009 to May 2010. An anime television adaptation produced by Sasayuri premiered in March 2025.
A story based on the real life group called the Himeyuri students.
Written and illustrated by Machiko Kyà Â, Cocoon was serialized in Akita Shoten's manga magazine Elegance Eve from March 26, 2009, to May 27, 2010. The series is the first part of Kyà Â's trilogy of manga about war. Its chapters were collected into a single book volume on August 5, 2010. A single volume that consists of the series' chapters and a side-story was released on April 17, 2015.
In October 2025, Viz Media announced that they licensed the series for English publication.
An anime television adaptation was announced on June 27, 2023. It is produced by Sasayuri and directed by Toko Ina, with Hitomi Tateno serving as animation producer and Kensuke Ushio composing the music. The 60-minute film premiered with an early broadcast on March 30, 2025, on NHK BS, followed by a main broadcast on August 25 on NHK General TV.