Domino's Pizza Japan: Fortressing or Market Expansion?

In late 2018, the chief executive officer and president of Domino's Pizza Japan Inc. was convinced that a substantial expansion in the Japanese market was needed and feasible for continued growth. His company had already grown to nearly 550 stores across Japan, which was over double the number only five years earlier. The company had numerous opportunities to grow further, including opening new markets; opening stores closer to the company's customers; and building on customer insights, new menu offerings, and a new marketing approach. In particular, the chief executive officer wondered whether priority should be given to new markets in Japan that the company had not yet entered, or if priority should be given to greater penetration in Japanese locations where it already operated. What strategy was the best option for expansion in the Japanese market?