After a life devoted entirely to games and anime, Ryoung — a young man bound by a terminal illness — faces his final moments... or so he thought. Instead of the end, he meets a mysterious entity who offers him a second chance — but not as a human.

Reincarnated in an unknown world as a legendary creature, an Ultra Beast named Cyantherion, Ryoung must adapt to this new reality, discover his true nature, and face the dangers of a world where humans and Pokémon coexist — and where he himself is something far beyond comprehension.

With an uncertain fate and powers even he doesn’t fully understand, his journey as the first of his kind is just beginning… And who knows — perhaps the universe itself has prepared something special to guide him.


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 Author’s Note:

> This is my very first fanfic, and the entire process of proofreading, editing, and translation is being done with the help of ChatGPT, an AI developed by OpenAI. If you find any mistakes, feel free to comment! Your feedback is greatly appreciated and will help me keep improving. 




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✦ That Time I Reincarnated as an Ultra Beast ✦


› 5 chapters per week — a steady rhythm for your journey!


› No main chapter is scheduled on these days


› But stay alert! Side-stories, bonus content, or unexpected reveals may appear without warning!


Get ready to dive into the world of Cyantherion — a story where even rest days aren't completely predictable...


OFFICIAL SCHEDULE!!!