NTSC/Region 0. An ordinary high school girl Ai Hoshino (Yuki Shimizu) was kidnapped by somebody on her way to home. Afterward, she awoke at the hideout of Joker, who is being commanded by Black Maria-the incarnation of evil. Fortunately she escaped with help from her teacher Aoyama (Tsuyoshi Kida). But she had been used to create a replicate. Escaping from Joker, she took counsel with her friend Yumi Katagiri (Shizuka Nakamura). However Yumi was also replicant, and Yumi had been brainwashed and had sworn loyalty to Joker. Yumi mercilessly attacked Ai who was confused about Yumi's actions. And then the strongest enemy appeared. At the climax, wearing powered suits from Aoyama, Ai became the Masked Girl and stood up to her enemies.