Tsui Ling

Tsui-Ling (翠鈴, Tsuoi Rin, Cuìlíng) was the girl Kazuma was unable to save in the past before he became the Contractor.

History
Tsui Ling was Kazuma's former lover during his exile when he went to China. Kazuma loved her dearly. At one point, Tsui Ling and Kazuma were captured by Stars and Sagacity.

She was sacrificed by the head of the Armagest, Erwin Leszaar, to summon a demon. Bernhardt Rhodes used a spell to gather her remaining essence into a being he called Lapis. Before her sacrifice, she and Kazuma worked in a restaurant and were in love. In the last Episode 24, Lapis states that her last thoughts were that she wished Kazuma was dead. Whether this is the truth or a lie meant to cause Kazuma pain, this remains unknown (Kazuma notes that she may have said this out of spite towards his inability to save her). As for Lapis, she is trained in anti-mage fighting and served under her master, Bernhardt Rhodes, and can be considered as a member of the Armagest.

Legacy
Tsui Ling is occasionally seen throughout the series whenever Kazuma is in some distress. Her death and Kazuma's inability to keep his promise to protect her became his driving force to protect everyone with his wind powers. Her image would also be used against Kazuma to haunt him as Bernhardt Rhodes would use her image to torment Kazuma through Lapis, a near-identical replica of Tsui Ling born from her final thoughts.