Another one of Sakuya's best friends. She is very beautiful, and often argues with uuuri. Though her name is "Hijiri", she is referred to as "Sei" by Sakuya because the kanji in her name can be alternatively pronounced as such. She is also apparently an intimidating person, and even overwhelms the majority of her teachers. In the ninth chapter of the manga, Yuuri remarks that Chihiro seemed like a second Hijiri. She is the president of her class.
Wikipedia [spoiler] After knowing Chihiro's tragic past, she suggested Shiina not to be with Chihiro because (according to chapter 33) she is afraid that Chihiro will abandon Sakuya and return to Sakura.
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