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Destruction by the black "stone" begins! The boy akira solves various cases in order to collect mysterious "stones" with power. On the other hand, the Kuroki family, a dark organization, also collected "stones". The Kuroki Lei, the head of the Kuroki family, was strong enough to hold all mankind hostage by the power of the "Black Diamond". And those two? [Recommendation from editor] It is said that "stones" have a mysterious power since ancient times. This work is based on such stones. The author, 石蕗 Eichi (Tsuwabuki Eichi) loves stones. Please enjoy this convincing story that can be drawn only because you love stones.