Major convenience store chains, which have seen sluggish sales amid severe competition in a highly saturated market, are trying to diversify in a bid to mine more promising market segments.

99 (Kyukyu) Ichiba Co., an affiliate of major convenience chain Circle K Sunkus Co. and whose existing stores operate 24 hours a day and sell perishables, opened a new shop in Edogawa Ward, Tokyo, earlier this month similar to 100 yen shops.

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