میساکی فیوجیوکا

Mei's cousin.

[Spoiler: Mei and Misaki are twins at birth, but due to circumstances, Mei was adopted by her aunt, Kirika. Even though Kirika didn't allow Mei to see her sister and mother, Misaki and Mei were meeting each other secretly. Unfortunately, Misaki died from leukemia.]

[Spoiler: In the sequel novel, she joins class 3-3 as an extra/dead causality. Her new surname becomes "Makise", from her mother's remarriage following her original death.]