Specials bundled with the Blu-ray and DVD volumes of Overlord featuring simplified character animations.

Ye Chen, an ancient god, who fell from the world of the gods into a heavenly and peaceful world. In this world there are hundreds of countries, surrounded by thousands of states, who are strong and arrogant. Ye Chen has been in this world for hundreds of years and has established great strength, moreover his existence has always been a legend. But the power of the gods' world extends slowly into this world, beginning one of the most cruel and ferocious battles.

In the year 1939, humanity was on the verge of destruction. Equipped with weapons of devastating power, a mysterious alien race, known as the Neuroi, began an invasion of the Earth, ravaging the planet, obliterating countries, and vanquishing human armies. To counter this seemingly unstoppable force, the world's powers united. A new device was produced, called the Striker Unit, capable of facing Neuroi technology. Girls equipped with the Striker Unit became known as the Witches, forming humanity's last line of defense. They began their fight against the Neuroi, utilizing their now-enhanced magical abilities, flaunting destructive weapons no human could manage. Fast forward to 1944—Yoshika Miyafuji is a young teenage girl who eventually decides to join the 501st Joint Fighter Wing, known as the "Strike Witches." With no formal training however, can Miyafuji learn to cooperate with her fellow Strike Witches? And if so, can she save humanity from the Neuroi onslaught? [Written by MAL Rewrite]

The story is set in the year 311 of the Orbital Calendar, when humanity has migrated to countless colony clusters in space. A space colony girl named Akiha Shishidou encounters a malevolent artificial intelligence named Leopard that has been installed on a colony. Akiha is joined by an Inter-Colony Police officer named Itsuki Kannagi, a taciturn young girl named Honoka Kawai, and a robot named Imoko "Imo-chan" Shishidou.