- Official name:夜叉神天衣
- English name:Ai Yashajin
- Chinese name:夜叉神天衣
- Other names:やしゃじん あい / 天ちゃん
- Gender:Female
- Birthdate:Dec 10, 2007
- Age:9
『Ai Yashajin』
Yaichi's second disciple, also nine years old and in the third grade. She has been living with her wealthy grandfather since her parents' deaths. Her father was a skilled amateur shogi player who'd met a younger Yaichi years ago while having an exhibition match against the Meijin. After Yaichi found a path that would have given him a checkmate, Ai's father had suggested that Yaichi someday take his daughter as a disciple, to which he agreed. She was frustrated to see that he does not remember her father, who'd never stopped admiring him, but eventually accepted his request to make her his disciple. She is very proud and prone to display tsundere traits.
Her shogi style is opposite to Ai's, showing a deep understanding of the early game and a strong insight into"defensive" play, based on traps and counterattacks. The way her style complements Hinatsuru Ai's is part of the reason that Yaichi felt she'd make a great rival for her. Besides, she is good at using Gote's Tempo Loss Bishop Exchange, which, together with her"defensive" play style, are the influences by her master, Yaichi. Yaichi gained so much respect from her father that she learned from Yaichi's every kifu her father could acquire before she really meet Yaichi.