The Weakest Tamer's SSS-Rank Dragons

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Your future is forged at age ten, bound to the beast you summon. While others tamed tigers and eagles, I got a creature so weak it was barely alive. I became the ultimate failure, the weakest tamer to ever live. My family's hopes turned to dust. But my pathetic partner has a secret. It’s a secret whispered in draconic blood, a power that will let me tame the SSS-rank tyrants of the sky. They all laughed at me, but who gets the last laugh when you command an army of dragons?