Ain (アイン) is the heroine of Shin Megami Tensei: 20XX, an amnesiac black skinned girl that lives in Valhalla.
- Shin Megami Tensei: 20XX: Heroine
Ain is a young girl who lives in the West District of Valhalla. She is called a "witch" by the citizens because she can use magic and has a tendency to become friends with demons. While exploring the city, the hero sees a powerful demon trying to possess her, and after he defeats it, she introduces herself as "Ain" and joins the hero due to him saving her. She does not play much of a role in the game, except keeping the hero's alignment by not allowing him to talk with demons of opposite alignments.