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Not sure if you're asking if they will be there again. They already made their debut, Kaito on the last Mikupa and Meiko on the last 39's Giving Day.

So far we don't have any new information about future concerts, but if they make another concert it have highly chance of them appearing again since they already made their debut. I would like to see Kaito on the SEGA models, since I'm not a fan of the MAGES models.