Angel and Devil Robots: Personifying a Dilemma to Influence Willpower

“Angels and Devils” express a human’s dilemma. In this paper, we produced this expression with multiple robots and investigated how humans change their decision and behavior in a moral dilemma environment. We divided the participants into Neutral-Neutral and Angel-Devil robot groups and investigated the willpower of the two groups by the alphabet writing task. We also examined the impression of the robots by Godspeed questionnaires and the results of the questionnaire.