From Tokyograph:

KAT-TUN has just added six more dates to their upcoming concerts this spring. In January, they announced that they would be performing for a record 7 consecutive days at the Tokyo Dome, but with the extra concerts, they have now upped that number to 8.

Approximately 385,000 tickets were available for the original 7 concerts on May 15-21, but there were reportedly about 850,000 requests for tickets during the pre-order period alone. In response, Johnny’s Jimusho has scheduled three additional shows at Tokyo Dome and three at Osaka Dome.

KAT-TUN will now be performing at Tokyo Dome for eight days in a row on May 15-22. They will then travel to Osaka for three concerts on May 29-31, before returning to Tokyo Dome on June 14-15. Together, the 13 concerts will gather an audience of roughly 685,000 fans.