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Haruna Kisaragi is Yui's best friend. Her personality is almost completly different from Yui's, as Haruna is calm, polite, and caring and Yui is perky, optimistic and cheers up others whenever she can. Despite this, the two are close friends and care about each other. Haruna was orginally meant to be a corrector, but I.R confused her with Yui because of Grosser's intervention.