Nanagi Seika♀

Nanagi Seika, the current president council of Amatsuhara Private Academy is the only remaining member of the Nanagi family. Since the Kannagi family had ‘absorbed’ Nanagi family’s wealth and power Seika is in bad terms with Rito. But actually, even though both of them won’t admit it, they trust the capabilities of each others, as shown in the softball match in Wakana’s route. Seika intends to crush the Kannagi family who has taken everything away from her. She knows that in old times, the Kannagi family used to hold bloody ceremonies sacrificing people to grant them fortune.

[Edited from Kresnik's review.]