Tensei Shitara Kozakana Datta kedo Ryuu ni Nareru Rashii node Ganbarimasu

Reincarnated into a fantastical world with only the faintest fragments of his previous life lingering in his mind, the protagonist awakens to a reality far stranger than any he could have imagined. Rather than a heroic champion or a powerful mage, he finds himself trapped in the diminutive body of a river fish, struggling against the currents and the constant threat of predators. Just as confusion sets in, a mysterious presence—calling itself the "Voice of Heaven"—resonates within his consciousness, laying out a breathtaking evolutionary roadmap. At its pinnacle lies the form of a mighty dragon, a transformation attainable through the accumulation of experience points and systematic growth. Seized by a burning determination to transcend his feeble beginnings, the young fish throws himself into a relentless hunt for survival and progression. Every prey consumed and every danger overcome brings him closer to the next evolutionary step, but the world around him proves to be far more complex than he initially assumed. This realm is governed by the mechanics of a living game, where magic hums through the environment, hidden skills await discovery, and levels dictate the hierarchy of all creatures. Embracing the monumental challenge ahead, the hero charts an incredible course from the very bottom of the food chain. As a mere minnow in an unforgiving ecosystem, he sets out to defy destiny, driven by the singular goal of evolving from the weakest of beings into the ultimate legendary dragon.