Yuki Aihara is a young girl who, despite her appearance, is rather mature and knowledgeable for her age. She lives in Nogezaka, Yokohama and is the main focus of the second Liminality episode.

Yuki's character in The World is called Yuki-chin. Sieg and Kyo are two characters she plays with frequently, but not much else is known about her online.

Yuki is a high school student who lives with her brother and pregnant sister-in-law Miho at her family's flower shop. She dislikes her brother, who gave up his dreams of an acting career just to get married. Not much else is known about her family.