Suzushiro (Twin Brother)
Volume 3, Chapter 11
Despite the fact that she has been deemed emotionless, Suzuna often displays apathetic reactions and has adopted a curt attitude towards people because she is not good at expressing her emotions. Her personality developed this way after her simulation battle with Shinobu, where the latter held back against Suzuna. Suzuna, who didn't know Shinobu saw her as a friend, felt betrayed and became furious. She if often annoyed by the naivety of her twin brother, Suzushiro.