Department store group Isetan Mitsukoshi is to revamp its store network as part of a three-year plan starting this year.

The retailer plans to invest in renovating flagship stores in greater Tokyo, and from 2015 switch focus to other areas.

According to Hiroshi Onishi, the chief executive due to take up the post this month, the retailer will not be opening new stores in Japan but has not scheduled any closures of regional or suburban locations.