Ajisai is a character from the original anime series Dusk Beyond the End of the World. Her voice is provided by Haruka Shiraishi. She is the owner of a hot spring establishment known as the Pheasant Hot Springs.

Ajisai shares a deep and significant bond with another character named Haniyama. The two have a special partnership in which they refer to each other as Elsie and Sierra, with Ajisai taking the role of Elsie. She values her time with Haniyama above almost everything else and has a great appreciation for hot springs. Her personal wish is to manage the inn together with her partner.

The central challenge in Ajisai's life stems from Haniyama's demanding career. Haniyama is a dedicated administrator for the organization OWEL, and for unspecified reasons, she prioritizes her professional responsibilities over her personal relationships. This commitment to work has put a significant strain on their connection, creating a tense and difficult situation between the two. One specific source of this tension is a promise that Haniyama made to help at the hot spring inn, a promise she has so far been unable to fulfill. Consequently, Ajisai's role in the story is closely tied to this strained but important relationship, as her desire for a shared life with Haniyama is constantly challenged by Haniyama's obligations to her work. No specific notable abilities are detailed in the available information.