The High School Fleet Broadcast's 3rd Anniversary Event debuted a new teaser trailer for the upcoming new High School Fleet anime film on Sunday. The teaser and the anime's website reveals the film's cast, staff, and premiere in early spring 2020.

These cast members is reprising their roles from the earlier television anime and original video anime:

Momo Asakura as Mikan "Mikan-chan" Irako

as Mikan "Mikan-chan" Irako Kanae Itō as Akane "Acchan" Kinesaki, Homare "Hocchan" Kinesaki

as Akane "Acchan" Kinesaki, Homare "Hocchan" Kinesaki Airi Ootsu as Mimi "Mimi-chan" Tōmatsu

as Mimi "Mimi-chan" Tōmatsu Kana Asumi as Minami "Minami-san" Kaburagi

Sora Amamiya as Moeka "Moka" China

as Moeka "Moka" China Satoshi Tsuruoka as Isoroku

as Isoroku Hiromi Igarashi as Wilhelmina "Mi-chan" B. I. Friedeburg

as Wilhelmina "Mi-chan" B. I. Friedeburg Chitose Morinaga as Thea Kreutze

as Thea Kreutze Ayaka Shimizu as Yui Fujita

as Yui Fujita Sanae Fuku as Sango Sugimoto

Takaaki Suzuki is once again credited for the original concept. Jun Nakagawa is directing at A-1 Pictures with the television anime's director Yuu Nobuta returning at chief director. Suzuki and Kunihiko Okada are back as the scripwriters from the television anime.

Naoto Nakamura is also returning to adapt Atto 's original character designs for animation, and to serve as chief animation director. Keisuke Watanabe is the sub-character designer. Kenji Teraoka is in charge of the mecha design , and \ Hisashi Tojima is designing the props.

The rest of the staff includes:

Aniplex is distributing the film.

The original 12-episode television anime series premiered in Japan in April 2016. Aniplex of America licensed the series, and the show streamed on Crunchyroll , Funimation , and Daisuki . An original video anime ( OVA ) shipped on Blu-ray Disc in May 2017.

Aniplex of America describes the story of the television series:

Living by the sea, protecting the sea, and journeying across the sea...They're the BLUE MERMAIDS! Because of a shift in tectonic plates around 100 years ago, Japan lost much of its area to submergence. To preserve Japan's territories, Coastal Cities sprung up, one after the other. Eventually, they became Marine Cities, and along with the expansion of sea-lanes to connect them, the need arose for a sizable staff to protect the seas. At the same time, maritime jobs were becoming more popular among women. Hence, the BLUE MERMAIDS, tasked with keeping the seas safe, had become every female student's dream job. This is when childhood friends Akeno Misaki and Moeka China enroll in a marine high school in Yokosuka, along with other girls who share their goal of "BECOMING A BLUE MERMAID."