Tsukiyono Kageko (Shadow Girl) is a former female detective. Shadow, a demon of justice who has fought devil worshippers since ancient times, has been searching for a successor. At that time, Shadow, who saw through Kageko's righteous heart, chose her as his successor and she became a demon who controlled shadows. Her hatred for evil resides in the shadow, causing it to split into a heroine of justice called Shadow Girl. However, Kageko's true form loses fighting power after splitting! Black Spider, a devil worshipper and evil organization plotting to conquer Japan, plots to defeat Shadow Girl by attacking Kageko's true form when she splits. Then, the demon Tokudane plans to capture Kageko's true form and Shadow Girl and broadcast their appearances nationwide... [BAD END]