Willan Rastel Amstira is an elf princess and twin sister to Arsura Magistir Amastira, part of an elven royal family during a centuries-long war between elves and humans. To forge peace, a political marriage is arranged for Arsura with a human prince.

Willan acts as Arsura's personal protector during their journey to human lands. When the half-elf, half-human Darsh Krim and his forces kidnap both sisters, Willan tries to shield Arsura from Darsh. In a significant act of sacrifice, she offers herself to Darsh instead, pleading: "I don’t care what happens to me, just don’t touch my sister."

Following her capture, Darsh exploits both sisters, manipulating their deep devotion to each other to force compliance. Willan endures sexual demands with more acceptance than Arsura, though both suffer humiliation and forced scenarios, including one instance where Willan is presented naked in a garter belt before being assaulted by Darsh in Arsura's presence.

Throughout these events, her elven heritage and striking physical resemblance to her twin sister remain evident, their appearances reflecting their shared royal lineage.