Prelude-Dr Goto troubled patient

He's the Great Storm Dragon!" the man continued to list off Veldora's past exploits. "The same one who caused the Seven Days of Fire!" Michiko could see that ever-growing smile on the True Dragon's face.

Veldora Tempest, the great storm dragon, a true dragon has been transported to a familiar world with his powers and strength seemingly gone. This true dragon will have to start from scratch to regain his lost abilities in a world with very little to no magic.
Reverse Isekai Story

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