Yukiko
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Yukiko is the aunt of Houki and Tabane. It is unknown whether she is the sister of Houki's and Tabane's mother or father. (Source: Infinite Stratos Wiki)
Yukiko is the aunt of Houki and Tabane. It is unknown whether she is the sister of Houki's and Tabane's mother or father. (Source: Infinite Stratos Wiki)