Electronics retailer Yamada Denki plans to increase its stake in domestic rival Best Denki to more than 50%, up from 7.5% at present.

Yamada Denki will invest ¥10bn (£81m), in an attempt to cement its leading position in the Japanese electronics market.

Best Denki will remain a publicly listed company and retain its name. The retailer will use the funds to optimise its store network.