^ They only called concert tour 15 th Anniversary because that is the year of her 15th anni! Singer never do anything special in that kind of year (they just release songs or best album because they're singer). So I don't know what you expect! That she sing evolution & dance in the street naked? That she create a gold statue & put it in the center of Tokyo? Even for her 10th Anniversary she did nothing special, only concerts & new songs. You're only disappointed because the reality is different from your wishes!
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