Tsui Ling

Tsui-Ling is a mysterious girl that shows in Kazuma's flashbacks in the early part of the anime, always asking, "Was I really born to be eaten by a demon?" The first time she is mentioned is when Kazuma beats his father and asks "What should I do, Tsui-Ling?" Several things trigger his memory of her, such as the statement of Michael Hurley that he belongs to the Stars of Sagacity. Almost nothing else is shown of her until the last 6 episodes.

In episode 19 it is revealed that a woman named Lapis was made in her form from her remaining sentience, but instead of Tsui-Ling's jade-coloured eyes, Lapis's eyes are purple in colour. Later, the full story of Tsui-Ling is shown. She and Kazuma met after he was banished from Kannagi and left Japan. They were in love and he lived in her house. One night he promised to protect her and always be at her side, like the wind was. However, the leader of Armagest sacrificed Tsui-Ling to summon the most powerful Youma, Belial, due to Kazuma's inability to protect her. According to Lapis, Tsui-Ling's last thoughts were directed at Kazuma and were "I want to kill you" which Kazuma attributes to his inability to save her.