Kevin's mother.

She and Tetsuji invented Exy 30 years ago, while she was studying abroad in Fukui, Japan.

She died in a car accident when Kevin was still a child.

Kayleigh had an affair with David Wymack, but chose not to tell him that he was Kevin's father: she knew Wymack wanted to coach a NCAA team one day and didn't want him to give up his dream to help her raise Kevin, and she was also unwilling to give up her current situation and move to the United States.

The only person she told was Tetsuji Moriyama in a letter.

She was from Ireland.