In htoL#NiQ: The Firefly Diary, you will guide Mion's escape from her dark confines by controlling two fireflies—Lumen and Umbra. Direct Mion's movements as Lumen, and destroy obstacles as the shadowy Umbra. Untold mysteries await as you guide Mion to the surface, overcoming traps and puzzles along the way. But be warned—the shadows are never far, and they're always hungry...