Billionaires in Tokyo — Cynthia Dane

It's taken two years, but Kathryn Alison is finally an employee of her boyfriend's real estate and hospitality company. All so she can accompany him on an official business trip to Japan, where the business etiquette is so strict it would be simply unbecoming otherwise.

All well and good, however, until the deal is sealed and Kathryn and Ian go their separate ways to party the night away.
When Kathryn wakes up? Ian is gone. What ensues is a search for her beloved that takes her on more than a physical journey through Tokyo. By the end of the trip, Kathryn will have the biggest wake-up call about what her boyfriend truly means to her â€" and how she can take him beyond mere boyfriend status.

Let's just say it's a good thing she saved that marriage license from Vegas.