Dance of Sapphire

There aren't very many people that have gems. They are a rarity, which is why an elder gem that goes by the name of Mephisto Pheles, built a school for Gems only. Within the school, there is a cram school for those who want to fight the Diamonds, traitors to Gem-kind. This includes fusion, something Rin has always wanted, but knows he can never fall too deep into because of his heritage.