Isla was a Giftia who was said to be the top Giftia marksman of Terminal Service One. She was previously partnered with Kazuki Kuwanomi. After her partnership with Kazuki was dissolved, she became the partner of Tsukasa Mizugaki. Isla was introduced as a Giftia showing little to almost no emotion, but her partnership with Tsukasa Mizugaki has led her to develop in this aspect. She is very innocent, and often has difficulty understanding how social situations should work. When it comes to Tsukasa, Isla wishes to make him as happy as she possibly can. She also becomes jealous very easily and wants to be as useful to him as possible before her retrieval date. Isla cares deeply about the feelings of others. It has been stated that she was the first employee of Terminal Service One to cater to the needs and emotions of her clients. The rest of the staff later followed Isla's example at Kazuki Kuwanomi's request after an incident revolving around one of Kazuki's assignments.