The Fourth Primogenitor—That’s the world’s strongest vampire that should only exist in legends. Accompanied by twelve Kenjuu and spreading calamity, this phantom vampire appeared in Japan. For the observation and obliteration of this Fourth Primogenitor, the government and Lion King decided to dispatch an attack mage known as a Sword Shaman. However, for some reason, the one chosen for the observation was a apprentice Sword Shaman girl, Himegari Yukina. Wielding the strongest anti-primogenitor spirit spear, Yukina arrived at Demon District, Itogami City. What is the true identity of the Fourth Primogenitor, Akatsuki Kojou, she encountered over there!?

Fifth season of Strike the Blood.

Strike the Blood new OVAs

It was announced at a Dengeki Game Festival stage event that the Strike the Blood light novel series will get a third OVA release. It will cover until the end of Seisen-hen.

Fourth season of Strike the Blood.

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It was officially announced at the Dengeki Game Festival 2015 event that Strike the Blood will be getting a two-episode OVA series to be released at the end of 2015. The OVA will be an original story written by Gakuto Mikumo.

It was the year 1939 when the Neuroi appeared. Nobody knows where they came from or what their ultimate agenda is, but the fact remains that their attacks drove people out of their towns and cities. In order to take arms against them, humanity develops a new anti-Neuroi weapon called the Striker Unit. Using the power of magic to fight against the monsters, this new device enhances and amplifies the power of female magic-wielders. To use this device, young witches from all over the world have been brought together to form an elite task force unit called the 501st Joint Fighter Wing, commonly known as the Strike Witches.

Strike Witches is set in an alternate version of 1944, where the events of World War II are very different than what we know to be true. Alien invaders known as the Neuroi came to Earth in 1939. This is not the first appearance of the Neuroi as they have appeared at seemingly random intervals throughout human history. While the Neuroi primarily attack humanity using aircrafts, their mothership is able to produce a deadly miasma, a chemical that is fatally poisonous to humans, forcing the populations of affected areas to flee their homes. The Neuroi then use the poisoned areas to plunder Earth's natural resources to use against humanity. Luckily the miasma cannot spread across water, making the ocean humanity's main line of defense against the Neuroi. With normal humans unable to fight in the miasma, witches have become the forefront of military defense against the Neuroi. Each witch is able to deploy a defensive field around themselves that not only blocks the miasma but protects them from physical attacks as well. Utilizing leg mounted machines called Striker Units to fly into combat, the witches use their magical abilities to wield devastating weapons too large and ungainly for a normal person. The series follows the battles fought by the 501st Joint Fighter Wing, who battle on the front lines to defend the British Isles from the Neuroi. Will humanity be able to take back Earth and bring peace to their home? Find out in Strike Witches!

After discovering that Neuroi are capable of communication with humans and making peace with the nest above Gallia, the Witches squads are now on a mission to reestablish communication when the Neuroi completely vanish after a sudden attack. It is then that they discover a new massive nest that just appeared covering almost all of Europe. Ruthless and without mercy it annihilates allied forces along with many Witches. Word of the attack reaches Fuso and a support battalion is deployed to rescue the survivors, among the rescue team is the former Striker captain Sakamoto Mio and the now civilian Miyafuji Yoshika who wants to save her dear friends.

After fending off the threat of a Neuroi invasion of Romagna and destroying the enemy's nest over Venezia, Yoshika Miyafuji goes back to her home town in the Empire of Fusou. Despite the loss of her magical and healing abilities, the former officer of the 501st Joint Fighter Wing wants to continue studying medicine. This is in order to help those in need, both civilians and those on the front lines alike. She receives an invitation from a prestigious school in Europe and decides to accept the offer, embarking on a journey back to the war-torn continent. However, a new danger arises, as more and more Neuroi manage to break through human defense lines, appearing unnoticed in supposedly safe areas and disturbing the balance of power in Europe. Yoshiki's sense of duty collides with her inability to pilot a Striker Unit, but with her friends in peril, it seems that there is only one thing she can do.

Since ancient times, humanity has been in conflict against an otherworldly enemy called "Neuroi". At the forefront of this war are teenage girls who can use magic, called "Witches", whose powers are enhanced via the use of equipment called "Striker Units".The year is now 1945, and the 501st Joint Fighter Wing, commonly known as the Strike Witches, have just successfully defended Gallia and Romagna from Neuroi depredations. With their immediate duty complete, the 501st is disbanded, and its member witches return to their respective countries.One of these witches is Miyafuji Yoshika who had lost her magic powers in the battle for Romagna. Still determined to do what she can to help others, she returns to her homeland of Fusou and studies medicine.During this time, she is visited by Fusou Naval Cadet Hattori Shizuka who offers Yoshika the opportunity to study in Europe. Yoshika readily agrees and, together with Shizuka, departs for Europe from Yokosuka.However, unknown to her, the Neuroi are once again on the move...