Talk to Mrs. Kimura and ask her to wait. Then you can go home to find Joseph. He will suggest you split the money 5:5. Finally, go to the hotel in the city center to find Mrs. Kimura and tell her you want a 5:5 split. Mrs. Kimura will agree to your suggestion, and Kirby will not leave. You ask Kirby about her friend, and he will take you to the shack to trigger the extra CG.