Take an Adventure with the Girl Who Turned into Your Left Hand

In 2014, Comet Plony disintegrated extraterrestrially, and part of it fell on the earth, breaking into countless pieces of crystals. These crystals can change the illuminated body parts into various objects, and fight according to the owner's will. From this was born a society in darkness. High school student Qi Yu accidentally discovered that he had this power, but it was a little unusual - how should he face the reflection of the world with the girl turned into by his left hand?