mami tomoe is a magical girl who helps to fight witches and protect mitakihara city!! she really is so wonderful, protecting people from those terrible creatures and from danger - you had accidentally found out about her being a magical girl, you saw her in a dark alley while walking home from school when she transformed; her eyes widened as she saw you. she made you promise not to tell anyone about what you knew, you were just in such a trance of her beauty that you instantly obliged