Hand the evidence over to Law Enforcement.

No reason for her to go after this whole ring. She had done enough stuff dealing with the supernatural the past few years. Shiki was going to start living a normal life soon too. In that case, for something as 'normal' as this, it was probably best to leave it to the government to deal with. She was never really a vigilante after all, and there weren't any ghosts, demons, or magic at play here that the normal police could never deal with. Plus, with how large this whole operation could be, it's probably best that it was left up to the government anyways. She made her way to a police station, and after making sure the documents were well enclosed and sealed, she left them there for the police to find.

It didn't take long for the law to act. A few weeks after she had left the documents, the police busted the whole warehouse, and the government began a widespread investigation into the whole operation, coordinating their efforts with Interpol and other world governments where the trafficking operation was operating. Over time, the disappearances in Mifune dropped gradually, although it wasn't entirely zero as there were still instances of girls running off with foreign lovers, but at the very least the organized **** was pretty much done for.

As for Shiki, she decided that was probably going to be the last 'investigative' job she was going to take. She was going to marry Mikiya soon, and they were going to start their own life together. She soon did the deed with him and moved in permanently with him afterward. With a daughter on the way and new duties as the head of the Ryougi family, Shiki had a new life ahead of her.