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Irie Naoki's wife.
The female lead. She has been in love with the handsome and intelligent Naoki Irie since their first year in high school after hearing his speech at the opening ceremony. After their new poorly constructed house was destroyed in a mild earthquake, she and her father moved into the Irie household, her father being a very close school friend of Naoki's father. It is eventually revealed that Naoki has also been in love with her. Kotoko is not very smart, having been in Class F all through high school (Class F is the lowest) and a low status department at her university. She is however very spirited. She usually ends up in trouble and Naoki always saves her. After coming back from her honeymoon with Naoki, Kotoko decides to become a nurse, so that she could work alongside him.