S1.E31 ∙ Migiude no himitsu

After Mahiru Shirota rescues what he thought was an ordinary cat, he's pulled into the world of servamps. Life couldn't be more complicated.

Young amnesiac finds out that the army he was forced to join destroyed his father's kingdom. He finds shelter in a church and discovers that demons are trying to invade the world. He must find his past, vengeance and save the world.

The world of tomorrow is an arid wasteland. Humans must live in domed cities to escape the threat of mutant Contaminoid monsters.

In 1939 A.D., the imperialist nation of Germany invaded a neighboring country. At once, this war spread across Europe, and the era was dragged into a spiral of a great war.

In this world, there are three identical looking people in existence who split between them an energy-like force called Terra. This energy can be attributed to the amount of Luck or Life Energy that an individual possesses. There also exists beings who observe the human world, maintaining the balance of Terra, known as the Coexistence Equilibrium. These beings possess ability that surpass that of a normal human being and reside in hiding in places known as the Pure Place in tribes. They are called the Terra Guardians. This is a tale of battle that begins with a chance meeting between a human boy named Keita and a young Tera Guardian girl named Kuro.

An anime adaption of the fighting video game series, "Virtua Fighter".