Co-founder and lead guitarist of Girls Dead Monster.
Hisako is admired by Yui for her guitar skills and is good at playing mahjong. She uses a Fender Jazzmaster.
Hisako became incredibly good friends with Iwasawa and shows few people her goofy side. She wanted to from GLDEMO with Iwasawa because she reminded her of her old band's singer who had committed suicide.
She takes her music incredibly seriously and will flush her cool demeanor to attack anyone who says anything bad about her music; even her own band members.