|Yuuki Saya悠木 さや|
|Hair||Brown, Parted to Side, Ponytail, Short, Spiky Bangs|
|Body||Medium Breasts, Pale, Slim, Teen|
|Clothes||Clothing with Ribbons, Dress, Knee-high Socks, Ribbon Hair Tie, School Uniform|
|Role||Childhood Friend, Classmate, Eleventh Grader, Kouhai, Senpai, Student Council Secretary|
|Visual novels||Main character - Hitomi no Rakuin 2 ~Zettai Fukahi no Shinbigan~|
|Voiced by||Hara Akiha|
Kouichi's classmate and childhood friend who is also the student council secretary. She used to depend on Koichi and his intelligence when they were younger, but when Saya met Senka, she became her fan instantly and decided to join the student council. Saya thinks that if Senka and Koichi were to team up, they'd make an invincible team, however her suggestion was instantly rejected.