Shiki

Appears in the oneshot "Isshunkan no Romance" (A Romance of One Moment). Shiki is Midori's best friend since childhood, and claims that she has a male personality living inside her, that cheers her on when she feels down. She often visits Midori to escape her troubled home life. [Spoiler] Shiki's male personality takes control after Shiki tries to commit suicide. [/Spoiler]