Kotetsu no Daibouken

A young shinobi from Kyoto escapes from her ruthless mentor in Tokyo to her brother and immediately finds herself in the middle of a showdown with street hooligans, mages, and assassins. The background of the events is a corruption scandal, which is investigated by the head of the detective agency where the fugitive’s brother worked. It’s an interesting story, with fights, a girl with a demonic katana, and lots of fanservice.