Well, here are my ideas for now that I had for meeting Kumiko with TRS. Everything of course as very rough outline and heavily depending on whether one of you wants to play this with me or which char is the one that meets Kumiko.
Starting point always is, that Kumiko ended up with a thieves guild (or similar) after deserting from the military.
1. Kumiko gets a mission that she cannot arrange with her conscience and decides to flee before being killed because of insubordination. When fleeing from the thieves guild, she is cornered by them and rescued by a TRS runner that saw what happened ((this I also could write without interaction of an actual TRS-Player, and Kumiko could already be a TRS member when beginning RP))
2. When in thieves guild, there is a mission to intercept a message that is transported by a TRS Runner.
2.1 She didn't know, that the mission also included to kill the runner
2.2 mission changed when they realized that the message was not written but was only memorized by the runner.
2. She refused to kill the runner and instead tries to rescue him.
2.3.1 She rescues the Runner
2.3.2 she and runner can flee together
2.4 She and the kind of unexperienced Soar runner are rescued by a third Sirch runner that is protecting the Soar