The Second Dimension Begins with Becoming Otome's Childhood Sweetheart

Inside Two DimensionComprehensive Comics I thought that by traveling to the second dimension I could see the arrogant Eri, the service club, Kasumi, and Miss Kaguya. But something is wrong. Although there is Shiina, why is this Shiina Chizuru? Also, is there something wrong with my childhood sweetheart, Otome, my sister Rinka, I look so familiar.