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The text you provided describes the short stories included in the "Official Character Book 3: Under the Mask". The stories include a short manga about Ulquiorra Schiffer's past, a story by Makoto Matsubara about the fate of Tier Harribel, Emilou Apacci, Franceska Mila Rose, and Sun-Sun after the battle with Aizen, and a short story about a conversation between Rangiku Matsumoto and Izuru Kira about Gin Ichimaru.