This is the Welsh region of England. A young brother and sister were listening to the memories of their aunt. As a child, she has witnessed a fairy with small wings. Is the "Walpurgis Night", in which non-humans gather and make a fuss, a real event? My sister Meg makes her eyes shine, but her brother Arthur denies it with a blunt attitude. The personal computer seems more interesting than that. However, when he found a rusty sword stuck in a rock, he was involved in the battle with the evil witch Vivian ...! ?? Includes 3 stories where everyday life and fantasy intersect, including the title work "Walpurgis Night"!