The labyrinths and ruins that Mion must traverse along with her two firefly companions, Lumen and Umbra, are as unique as they are deadly. This special htoL#NiQ: The Firefly Diary art book will serve as a visual guide showcasing the world that Mion explores, and through the director's notes, you may be able to get a glimpse of the mysteries and dangers that lurk in the darkness...