Nao Saitou

Nao Saitou (斉藤 奈緒, Saitō Nao) is is the younger cousin and biological paternal half-sister of Yakumo Saitou who has been deaf since birth where she is unable to hear, but she is able to sense the feelings of those around her very clearly.

She lives with Isshin Saitou in a Buddhist temple before she is adopted by Kazutoshi Gotou and Atsuko Gotou after Isshin passes away.

Trivia

 * Nao's biological mother is Akemi Takagishi, who is Yakumo's teacher and had a crush on Isshin. She has a twin brother called Yuuta Takagishi, who is also Yakumo's half-brother.