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A colorless world, a pure white world, a world where everything is filled with only one color. What ought to be a young man's usual route to school—Sai was suddenly blown away, it was such an extraordinary world. There, he witness two young girls' fight unfold before him. One of them is a blonde girl he has never seen before, and the other is Mikage Mikuro, an upperclasswoman in his high school. Then, the blonde girl appeared as a transfer student before Sai, who has just returned to the origin...