is the twin sister of Kotone and the younger of the two. She, along with her sister, know that Junpei is cursed. They do not become cursed as they have innate anti-magic abilities, but only for self protection. She is tsundere, and has the ability to sense the supernatural. In the anime, Akari was said to not socialize much even at a young age, thus causing her awkwardness when it comes to dealing with people. The reason for this is because of her strong spiritual affinity, and she subconsciously avoided mixing around with other children.
She is also shown to have magical powers (though this is not the case in the manga). She is extremely possessive of Kotone; besides her twin sister, she seems to show no problem interacting with Junpei (though mostly for her mistaken perception that he's becoming too close to Kotone) like she does with most other people. In contrast to her sister, she is aware of Kanako's feelings towards Junpei.