The Fainting Brave and the Assassin Princess 2

The assassin princesses, who aim for the lives of the heroes, accept a rank advancement mission in order to broaden their assassination skills. However, to conquer the mission, a "bond" is required...?

The assassin princesses, who aim for the lives of the heroes, accept a rank advancement mission in order to broaden their assassination skills. However, to conquer the mission, a "bond" is required...?