Birthday: June 16
Height: 157 cm (5' 2")
Weight: 52 kg (114 lbs)
Likes: Banana

She is an uptight and by the book member of the Student Council's Hallway Monitoring Committee, it is hinted that she often reprimands Chiwa due to her rowdy behavior along the hallways. She and Eita's friend, Kaoru, were classmates in elementary school.

She is actually his childhood friend, whom he met 1 year before Chiwa. Ai and Eita went to the same kindergarten. She is also actually Eita's fianceé; they got engaged in kindergarten.