Aoki Hagane no Arpeggio: Ars Nova - Recommendations

• TV (12 eps)
• 2015

In a world where humanity has lost control of the oceans to the deep sea fleet, the only hope to counter this threat are the Kanmusu, a group of girls who possess the spirit of Japanese warships. The story revolves around Fubuki, a destroyer who comes to the Chinjufu base to train with other Kanmusu.

• TV (12 eps)
• 2016

Akeno Misaki and Moeka China share one goal—to join the Blue Mermaids! A group of fierce women, the Blue Mermaids are key to keeping peace among the seas and coastal cities in this age of maritime trade. To be a part of this elite group of sea protectors, they must succeed at Yokosuka's Marine High School. Akeno and Moeka, together with their classmates, will take the plunge to become Mermaids!

• TV (12 eps)
• 2019 - 2020

Azur Lane, a combination of all the different Camps in the world, was once successful in repelling the underwater menace, the Siren. Now splintered, they must face a new threat in Red Axis, former allies who crave to wield this otherworldly Siren technology for their own nefarious desires! Who will be victorious in the never-ending war between these battleship girls!?

• TV (13 eps)
• 2000

In a far and distant future, men and women have become mortal enemies. Each living on seperate planets, an interstellar war is being fought between the two very different peoples. Hibiki, a mere 3rd class worker, finds himself in the middle of a huge space battle, facing the nemesis of mankind: Womankind!

• TV (25 eps)
• 2004

"Are you there?" This is the question that the aliens always demand before they attack. The quiet island of Tatsumiyajima is secretly the last line of defense against mysterious invaders. In a quiet and rustic villiage, children were raised without any knowlege that they were born to pilot the Fafnirs, giant robotic war machines of terrible powers that are the only thing that can defend all they hold dear.These children's struggles will be the only thing that can hold off an enemy that attacks both our bodies and our sense of identity...

• TV (12 eps)
• 2012 - 2013

Forget track and field! At Oorai Girls Academy, they practice Shensha-do, the art of tank combat! But Miho transfers there believing it to be the one school where Shensa-do isn't offered. She's in for a rude awakening, however, when the student council president demands her participation in the sport. Together with four friends, she learns to face her fears, find herself, and have a whole lot of fun along the way. Get ready for tank fighting mayhem in Girls Und Panzer!

• TV (26 eps)
• 2007

Far, far away in a distant time, there is a tribe of people called the Golden Tribe who have the ability to create stars and foretell the future. They gave out a warning to those who have yet to mature: 'Move.'. Three tribes answered their call: the Silver Tribe, the Bronze Tribe, and the Heroic Tribe. Soon after, the Golden Tribe encountered a crashed ship in which only a baby human known as Age survived; they named the child's race the Iron Tribe and assigned one of the few living members of the Heroic Tribe to protect him and his race. Now, in a distant part of the galaxy, humanity is threatened with extinction at the hands of the other tribes. With only a prophecy to go on, they set out to the deepest depths of space to find their savior named Age -- humanity's last hope.

• TV (12 eps)
• 2019

Mysterious flying creatures called Zai suddenly appear and overwhelm all of mankind's aerial combat forces. To fight them, mankind modifies existing aircraft frames to create mechanized soldiers called "Daughters," which are operated by automated piloting mechanisms called "Anima" that have the appearance of human girls. The story begins when Narutani Kei, a boy who yearns to take to the skies, encounters a shining red aircraft and its pilot, an Anima named Gripen who has been named mankind's trump card.

• OVA (2 eps)
• 2003 - 2004

Under the threat of terrorism, the world’s navy united as the Peace Keeping Navy (PKN); and though each country contributed an atomic submarine, Japan offered only one powered by diesel – the 707, otherwise known as Snapping Turtle. During the first meeting of the navy the terrorist organization known as the USR attacks and tries to take out the Apollo-Norm aircraft carrier, but at the last minute Captain Hayami sends the 707 in the path of the torpedo. Now, with a newly-commissioned 707 and two minisubs, Captain Hayami is back at the helm – and his sights are set on taking down the USR...

• OVA (1 ep)
• 1997

To combat the terrorist organization known as "USR", eleven countries combine their naval forces to form the Peace-Keeping Navy (PKN). However, all hell breaks loose when Admiral Red and his USR submarine UX crash the PKN's inaugural ceremony and destroy majority of the fleet. At the last minute, when the UX lands the final blow on the aircraft carrier Apollo-Norm, the obsolete Japanese submarine 707 (a.k.a. "Snapping Turtle") appears from out of nowhere and sacrifices itself to save the PKN flagship. Six months later, Captain Youhei Hayami is called back to duty to lead a new group of recruits and captain an all-new 707 in the war against terrorism underwater.