Aya Oogai

is a character exclusive to Lost Small World, and is an old friend of Misaki Yata's as well as Saruhiko Fushimi's relative, as the daughter of his father's cousin.

Appearance
Aya is a relatively short girl with pale skin and light mauve eyes. She has straight, medium length brown hair styled in twin tails and held up by yellow bows. She has a straight fringe across her forehead separated in the middle with two thin strands of hair.

She wears a red blazer, white buttoned shirt tied by a red bow, and tannish-yellow skirt as part of her middle school uniform. Her backpack is a large, pink rabbit.

Personality
Despite her appearance, Aya has a sharp tongue and high self esteem. She is also shown to be very intelligent as she was able to decipher a code that showed the flight pattern of the strange blimb that floated around the city. She claims that the people who dislike her are more bothersome to her than she is to them. She talks with a certain 'tic', and in third person.

Plot
After Yata finds a letter stashed into his cubby hole he goes to talk to Fushimi about it and later runs into Aya, who was the one who placed the letter there. She cheerfully talks to the two boys (although Yata was visibly uneasy around her and hid behind Fushimi) and she proposed they go some place later. As Yata talks to her more, Aya claimed that she used to be in a group of girls who talked and dressed the same as she did, but left it later on.

When they all meet up, Aya explains to Yata through an app on how she found the flight pattern of the blimp that they were going to signal using a special light app on their phones. She turns to see if Fushimi was listening, and pouted when she noticed he wasn't paying attention to her.