Haifuri, also known as High School Fleet, is an anime series that aired in 2016. The story follows a group of young girls training to become Blue Mermaids, a naval defense unit tasked with protecting the seas. Set in an alternate world where much of Japan is submerged underwater, the series explores themes of friendship, teamwork, and the challenges of naval life. The girls face numerous trials and adventures as they navigate their way through both personal and professional growth.