During the last days of the war, Emperor Arthur Gaz orders one of his official to be in charge of a secret project codenamed Chaika. A month after the events of the Soara, Toru, Akari, Chaika duels with Lady Claudia Dodge, another of the Eight Heroes and her men but Chaika loses to Claudia. Despite this, Claudia allows Chaika and her companions to stay at her estate.