Chained Soldier, known in Japan as , is a Japanese web manga series written by Takahiro and illustrated by . It has been serialized on Shueisha's Shà Ânen Jump+ online platform since January 2019.
The series is set in a near-future Japan where portals to a dangerous dimension, called Mato, have appeared across the country. In response, the government establishes the Mato Defense Force (MDF), a special military unit composed of superpowered women, to protect humankind and fight the dimension's inhabitants. The story follows Yuuki Wakura, a young man who accidentally wanders into Mato and is rescued by Kyouka Uzen, a top-ranking MDF officer.
An anime television series adaptation, animated by Seven Arcs, aired from January to March 2024. A second season, animated by Passione and Hayabusa Film, aired from January to March 2026.
By June 2025, the manga had over 5.5 million copies in circulation.
Several decades ago, mysterious gates opened across Japan, leading to an alternate dimension known as . Two notable things were discovered within: malicious creatures known as , who are hostile towards humans, and Peaches, which grant superhuman powers to those who eat them. Since only women can gain powers by eating peaches, gender inequality was flipped and the world became matriarchal. To combat the Shuuki and establish a presence in Mato, the Japanese government took control of the portals and established the Mato Defense Force, a special paramilitary unit under the Japan Self-Defence Forces, tasked with protecting humanity and operating within the dimension.
In 2020, high school senior Yuuki Wakura is set to graduate and enter the workforce when he accidentally wanders through an open portal into Mato and is attacked by a horde of Shuuki. Kyouka Uzen, commander of the Mato Defense Force's 7th Squad, rescues him, but they are both cornered by increasing numbers of Shuuki. Kyouka offers to place Yuuki under her power, so he can fight on her behalf as a combat slave so they can survive. After the battle, Kyouka is forced to reward Yuuki for his efforts fighting the Shuuki, which, in his case, involve kissing and intimate physical contact.
Recognizing Yuuki's potential, Kyouka offers him a job with their unit after he graduates. Eager to become a hero and avenge his missing older sister, Yuuki accepts. The story follows Yuuki's service in the Mato Defense Force as Kyouka's combat slave and base caretaker, while he explores Mato and discovers its mysteries.
Written by Takahiro and illustrated by , Chained Soldier began on Shueisha's Shà Ânen Jump+ online platform on January 5, 2019. Shueisha has collected its chapters into individual volumes. The first volume was released on March 4, 2019. As of January 5, 2026, 20 volumes have been released.
The manga has been licensed for English release in North America by Yen Press.
In November 2021, an anime television series adaptation was announced. It is produced by Seven Arcs and directed by Gorà  Kuji, with Junji Nishimura serving as general director, Yasuhiro Nakanishi handling series composition, Ryota Kanà  and Akira Kindaichi writing the scripts, Hiroyuki Yoshii designing the characters, and Kohta Yamamoto composing the music. The series was initially scheduled for 2023, but was later delayed, and eventually aired from January 4 to March 21, 2024, on AT-X and other networks. The opening theme song is , performed by Akari Kità Â, while the ending theme song is "Chain", performed by Maaya Uchida.
Sentai Filmworks licensed and streams the series uncensored on Hidive. In June 2024, an English dub for the series was announced, which premiered on Hidive on July 29 of the same year. Muse Communication licensed the series in Asia-Pacific.
A second season was announced on March 23, 2024, two days after the airing of the first season's final episode. It is animated by Passione and Hayabusa Film, and directed by Masafumi Tamura, with Keiya Nakano replacing Yoshii as character designer. The season premiered on January 8, 2026. The opening theme song is , performed by Kità Â, and the ending theme song is , performed by Uchida.
By November 2021, the manga had over 1 million copies in circulation. By January 2024, when the anime's first season aired, it had over 2 million copies in circulation. By June 2025, it had over 5.5 million copies in circulation.