~~~
<<Tomoika>>, the main settlement of the 21st floor, is nothing if not a caver's paradise. Fashioned from cavern openings of unearthly proportions, stalactites and stalagmites merge to support the weight of the rock above, and luminous mushrooms light up the bedrock streets. Tucked away, a hanging shop sign sits still in the Southern district of the settlement, depicting a flashy Sapphire crystal outshining a dimly-lit cracked gem.
At first sight, the shop's interior see