No. 76 knew her. She was sure about it. Even though over 400 years had gone by and she barely remembered the witch's name, the scene back then was still vivid in her mind.
She remembered the blue-haired witch dropped to one knee before the Three Chiefs of the Union, solemnly took over the cope and scepter which symbolized being a higher ascendant and accepted the personal blessing of the Quest Society's leader.
No. 76 was deeply impressed by the witch's figure when she turned to the audience and raised her scepter that as the youngest Senior Witch born in the Taquila age, her pride and confidence was deeply engraved on the minds of all the bystanders at the scene.
At that time, No. 76 merely served as an original combat witch for the garrison. When she looked up at her junior who was standing on the stage with boundless enthusiasm, she felt a sense of infinite admiration tangled with a hint of inferiority.
So the witch was Agatha.