OVA based on the Joker manga by artist Katsumi Michihara (道原かつみ) and writer Yuu Maki (麻城ゆう). Joker is a genetically engineered shape-and-gender-shifter, who created as part of a Special Police Task Force and fights crime of all kinds, but he/she also fits in a little romance around the edges.

Regular high schooler Taichi Nishimura and his childhood friend, Rin Azuma, are on their way to school one ordinary morning. Suddenly, a glowing light envelops them, transporting them to a fantasy world full of magical creatures. Upon their arrival, Taichi and Rin are threatened by a beast. They are promptly saved by a group of adventurers, who advise the pair that traveling unarmed and inexperienced makes them vulnerable to the recently increasing monster attacks. Taichi and Rin are directed to the Guild, where they can determine their magical aptitude and register as adventurers. However, the test they take reveals an unprecedented result: Taichi and Rin possess extraordinary powers that far surpass the standard mage, instantly transforming them from typical high school students to the ultimate cheat magicians. Taichi and Rin learn to grasp the full extent of their powers and familiarize themselves with their new world. However, while the duo seeks to uncover the reason behind their transportation and a possible way back to their original world, unexpected trouble lurks in the shadows.

On May 1, 1945 in Berlin, as the Red Army raises the Soviet flag over the Reichskanzlei, a group of Nazi officers conduct a ritual. For them, the slaughter in the city is nothing but the perfect ritual sacrifice in order to bring back the Order of the 13 Lances, a group of supermen whose coming would bring the world's destruction. Years later, no one knows if this group of officers succeeded, or whether they lived or died. Few know of their existence, and even those who knew began to pass away as the decades passed. Now in December in the present day in Suwahara City, Ren Fujii spends his days at the hospital. It has been two months since the incident that brought him to the hospital: a fight with his friend Shirou Yusa where they almost tried to kill each other. He tries to value what he has left to him, but every night he sees the same dream: a guillotine, murderers who hunt people, and the black clothed knights who pursue the murderers. He is desperate to return to his normal, everyday life, but even now he hears Shirou's words: "Everyone who remains in this city eventually loses their minds." (Source: ANN)

An entire city is destroyed by two monstrous and omnipotent beings. Genzou Kuruma, a scientist but also the leader of a sect wishes to awake God, but first, he needs a special kind of blood for it. His son, Shinichi Kuruma, and a young girl, Ayaka Sanders, possess that blood, and he will do anything to capture them and take their blood for God's Awakening, and so, humanity will be lost. Shinichi, along Ayaka and Tomizoro (Tommy), are escaping from Genzou Kuruma's "New Humans" (genetically altered humans who can turn into monsters), while Shinichi only wishes for revenge against his father. He, like the other "New Humans", has the power to summon different beasts from his body. With this power, he will fight until Genzou Kuruma is killed by his own hands.