アイ

Ai is the daughter of a noble family from the Demon World. She is well-educated, graceful, and gentle and has always been seen smiling sweetly. Her speech, thoughts, and actions can be considered 'Big-Sisterly'. She often refers to herself as "Ai-Onee San" to Rin.

She was Forbesii's first fiancée. Although their parents decided on her engagement to Forbesii, Ai herself seems to love him genuinely. In the main timeline, however, they break their engagement, and Forbesii marries Sage instead.

If the player decides to restore the original timeline, then Ai will be a potential heroine. The latter can be romanced with Rin in addition to having Nerine in the epilogue. In the epilogue of her route, she becomes Rin's second simultaneous lover after waiting for 20 years and reuniting with Rin in the human world.