Only daughter of the rich and powerful Kanzaki Shigeki (representative of the
Kanzaki zaibatsu (plutocrats), manager of Kanzaki Heavy Industry),
Sumire is the heir to the Kanzaki zaibatsu. Consequently she was
raised in an environment where she's the "super-daughter" who can
have and do whatever she wanted. That's why she tends to get into
arguments easily with other members of the Hanagumi, especially Kanna and
Sakura (whom she sees as her rival on stage).
But Iris gets along OK with Sumire, probably because they're
both the only daughters of wealthy families and thus a kind of bond
developed between the two.
Realizing her rather extraordinary psychic power,
Sumire joined the Hanagumi out of her own desire, but she often
disobey orders from her superiors.
In addition to her psychic abilities,
Sumire is very adept at the Kanzaki Kazachiriryuu style (literally the
Kanzaki Wind-Dust style ^_^) of
long sword combat (exclusive to the Kanzaki family).
Sumire has a rather exotic (sometimes even shocking ^_^) fashion sense,
always donning the latest and most expensive kimono/dresses in town.
Sumire is frightened sick of spiders.