lilith (mon-musu quest!)

One of 2 powerful succubi who were defeated by Heinrich 500 years ago, Lilith (リリス) & Lilim (リリム) are twins who were entrusted by Black Alice to lead their race to a haven. Lilith is the taller sister with a flat chest, and Lilim is the big-boobed younger one.
Not to be confused with Lilith, sister of Morrigan and Astaroth from the same series.