Also known as: 高橋夏海, 夏海先輩
A character from the Girls Und Panzer spin off, Phase Erika. She is a student of Kuromorimine.
She first appeared as one of Nishizumi Maho's subordinates in Girls Und Panzer Little Army. She was initially nameless but got her name in Phase Erika. She also appears in Girls Und Panzer Ribbon No Musha.