Circle K Sunkus (サークルKサンクス, Sākuru K Sankusu, stylized as CircleKSunkus) was a chain of company-operated and franchised convenience stores in Japan. The company is a division of UNY Co., Ltd., which licensed the Circle K name from Alimentation Couche-Tard, a Canadian convenience store company that owns the Circle K brand.

At the typical Japanese convenience store, goods such as magazines, manga, soft drinks, contraceptives, onigiri, and bento are available.

As of September 1, 2016, due to Circle K Sunkus’ acquisition and absorption by FamilyMart, all Circle K Sunkus stores have been rebranded as FamilyMart stores as a result of the FamilyMart Co. and Uny Group Holdings Co. merger.^[1]

The first Circle K store in Japan opened on March 15, 1980, in Tenpaku-ku, Nagoya.

The first Sunkus store opened in Aoba-ku, Sendai, on July 23, 1980. The Sunkus chain expanded to Tokyo in 1981, Hokkaido in 1982, Osaka in 1989 and Nagoya in 1992.

Sunkus and Circle K Japan formed an equity and business alliance in October 1998.

The franchiser, Sunkus & Associates Inc., officially merged with Circle K Japan Co., Ltd., as of the September 1, 2004, fiscal year and was known officially as Circle K Sunkus Co., Ltd (株式会社サークルKサンクス). The two brands remained separate — convenience stores owned by the company had either a Sunkus sign or a Circle K sign.^{[citation needed]}

The word "Sunkus" is a combination of the words "Sun" and the word "Thanks",^[2] The logo is a combination of the words "Sun", "Kids", and "Us".

• Official website - 2016
• Media related to Circle K Sunkus at Wikimedia Commons