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Shizuka Kusanagi (草薙 静花)Godou's little sister, who is in her 3rd year of middle school. Also a member of the Tea Ceremony Club along with Yuri.
Worried that her brother is becoming like their grandfather (a natural player), she is very strict with him to try prevent this. However it is also suggested that her being strict with her brother is actually a cover up for her jealousy as she may have a brother complex with Godou.