Miracle of the Deserted Island

There once was a thriving city by the name of Seraphine teeming with life and overflowing with prosperity. Situated on a silvery coastline with the mountains as its backdrop, Seraphine was a sanctuary to its citizens, a paradise lost to the world. One day, an unpredicted and fatal epidemic besieged this city of joy, dubbed the 'Sapphire Plague' because of the abnormal blue markings on the infected. Using up every last piece of medical knowledge, the people of Seraphine still stood helpless in stopping the relentless rampage of the disease.
Dr. Francois, a proficient scientist and medical practitioner in Seraphine, set upon a quest to find a cure. Every passing day amassed the shadows of despair and grief as he witnessed his once vibrant city withering away. He discovered a lead hinting towards a renowned indigenous tribe residing on a secluded island named Itheral, known for their ancient healing traditions. Leaving his afflicted city behind, Dr. Francois ventured towards this mysterious island.
Unfamiliar faces and a language barrier indeed made his work far more challenging, but the desperation to save his city jacked his determination. After succeeding in gaining the tribesmen's trust, they shared their grand elixir's story, made from the rare 'Aethusa Cyan Sky' flower, that could potentially cure anything.
However, the flower only blooms during the moonlit bath touched by the peak of a comet passing every thirty years, which was due tomorrow. Francois, alongside the tribesmen, engaged in intricate rituals and offerings, with hope blooming in their hearts. As the comet approached, the shifting forces and gentle cosmic glow awakened the hidden flower. Under the tribal chief's guidance, Francois prepared the elixir and rushed back to Seraphine.
His return sparked a glimmer of hope in the desolated city. Administering the magical potion to the inflicted, to everyone's disbelief, the blue markings faded and the sick conspicuously regained strength. The miracle of the deserted island was real, and the city rejoiced. Seraphine, once again, was a bustling city of joy.
The debt of the tribe was great, and the city never forgot their shared ordeal. Keeping their saviors' identity a secret, Seraphine established a health tradition named after the island. The chief and Dr. Francois became legend, their story a shared history; a beacon of hope that no disease was untreatable, and no cost was too high for a life saved. The day every year when the Sapphire Plague was eradicated was named 'The Miracle Day,' a symbol of resilience, hope, and the miraculous power of unity.
Over time, the city grew even more robust, producing the greatest medical practitioners dedicated to saving lives just like their legendary Dr. Francois. No plaque returned to the city, thanks to the health precautions and the miracle of the deserted island. The legend ran in the city's veins, justifying their prosperous and healthy lives, making them eternally grateful to their saviors' courage and their Miracle Day.