According to Sankei reported [J], Circle-K-Sunkus, the 4th largest convenience chain-store, announced on November 17th that it would replace its own reward points system with e-commerce giant Rakuten’s Rakuten Super Points.
Sales ranking of convenience store chains (2011)
These 4 groups occupied nearly 90% of domestic market.
| chains | sales(billion yen) |
| Seven Eleven | 3281 |
| Lawson | 1826 |
| Family Mart | 1535 |
| Circle K Sunkus | 980 |
by each groups’ financial reports via Lawson’s 2012 annual report [J, pdf]
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