Chocolat Meilleure and Vanilla Mieux are both witches and childhood friends, pitted against each other in a contest to see who will become the next queen of the Magic World! In order to win, the two queen candidates must attend school in the human world, cultivating relationships to bring out their classmates hearts of friendship and love... But if a witch gives their heart to a human, they'll die?! In an exciting adventure filled with transformations, mystery, jealousy, and romance, join Chocolat and Vanilla as they work alongside their knights to protect the kingdom from the threat of the Ogres and do their best to become the next queen!

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. (Source: MAL news)

In a research facility hidden away on a remote island, genius programmer Shiki Magata has lived as a recluse for years. She rarely sees guests, but associate professor Souhei Saikawa and university student Moe Nishinosono still seek her out. However, their meeting is cut short when they are caught up in a locked-room murder mystery. Everything is not as it seems, and many secrets are hidden. Within an isolated facility, a seemingly impossible and gruesome crime takes place, and Saikawa and Moe must unravel the truth behind the murder and Magata's shrouded past.

Preparations for a new offensive against the Neuroi—a mysterious race of alien invaders—are well underway. The objective is securing Berlin, the capital city of the Empire of Karlsland, which is necessary for wiping out the Neuroi threat from Europe. However, as the enemy is capable of adapting to the battlefield on a daily basis, the allied forces and the current state of Striker technology might not be enough to achieve a victory. Meanwhile, Yoshika Miyafuji, a Witch from Fuso, continues her medical studies in Lausanne. Having recovered from a recent incident that deprived her of magical power, she is eager to assist in the war effort. The call to arms soon arrives and the scattered witches of the 501st Joint Fighter Wing must be gathered once again for a final push against the enemy.