<step one>
After completing the Stage 4 to Stage 5 introduction, you will receive a flyer at your apartment advertising Cafe Newtype IV.
<step two>
Next time you visit the cafe at the mall, you will be greeted by the head butler. They will guide you to the back where you will encounter Kurt. He will explain that SISSI is tracking him through his cybernetics and that he is on the run. He needs you to find a way to disable the tracker so that he may move around freely once more.
<step three>
Visit the Bodyshop in the Student Quarter and speak with the nurse. She will tell you that it will cost 2500 credits to perform a house-call at the mall and remove the tracker. If you have the money, you can lock in the surgery.
<step four>
You will receive a call when the surgery is completed. After that, return to the mall to see Kurt on his way and finish the quest line.