The Adventures of Kotetsu

While walking the streets of Tokyo, Linn Suzuki finds a strange device sticking up from the sidewalk. All at once, thugs set upon her, and a beautiful stranger helps her, taking them all down. It seems young Linn has fled Deep Kyoto from her cruel mistress and has traveled to Edo, where she hopes to find her long lost brother, last seen working for the Kuon Detective Agency. By chance, this stranger happens to be Miho Kuon, who lets Linn stay with her, nicknaming her Kotetsu, or Little Tetsu, after her brother, Tetsujin. However, a mysterious agency called the Syndicate is after Miho, and Linn is now in the thick of things.