Celica Ayatsuki Mercury


 * Note: She's called "Sister" (シスター, Shisutaa), which may simply refer to either her being Nine's sister, or possibly a nun.

The younger sister of Nine, and aunt of Kokonoe.

Information
Sister lived with Ragna, Jin, and Saya in the church while watching over the corpse of the Black Beast. She was killed by Terumi Yuuki in the year 2192.