Evolving into a Great Dragon From a Koi Fish - Chapter 308 - he Depths

This is the story of a modern sailor who was accidentally reborn as a soldier of the Brazilian Expeditionary Force, and finally became the largest plutocratic family in Brazil by virtue of his foresight.

- Description from novelbuddy

Elia is a poor university student until the night she’s taken to the world of the Anima—ruled by humans whose ancient hearts pulse with the blood of animals. There she’s forced into a battle to the death. But when Elia survives, and refuses to kill her final opponent, the King must either kill Elia himself, or take her as his mate.

Reth, the brutal King of the Beasts with the blood of lions, shocks everyone when he chooses the weak, human Elia to become his Queen. He promises her every comfort of his wealth and position—but he is clear: She will not warm his bed. He chose her to defeat those that were trying to corner him into blending his Leonine line with the Wolves.

Elia needs the help of the Anima to become stronger and rule them well. But the vengeful Wolves see only a weak human that brought them shame. As Elia and Reth grow closer, the wolves are determined to destroy her. Will Reth and Elia admit their feelings for each in time to fight for the Kingdom—and their lives—against the villainous wolf-tribe? Or will the wolves kill Elia and steal the throne?

[Mature content - no sexual violence]

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He stalked towards her, chin low so the shadow cast by his hard jaw cut across the thick fur collar of his vest. His hair had fallen over his eyes in the scuffle, so he peered at her through it like a lion in the grass. With each step, his graceful, rolling gait reminded her of a predator stalking its prey. Despite the forest floor littered in twigs and leaves, he didn’t make a sound.

“Wh-who are you?” Elia stammered, backing away, her hands up. He met her step for step until she came up hard against the tree behind her—and didn’t stop until he loomed over her, so broad his shoulders and chest made a wall in front of her. She could feel the heat rising off his skin in the cool, night air.

“I am the Leonine King.” His voice was a dark, husky gravel. Behind him a chorus of wheezes, howls, and chirps of agreement rose from the people watching. “And you are?”

“Elia,” she breathed.

“Elia,” he growled, leaning in closer, bringing with him the scent of pine and rain and the musk of something distinctly male. “I am Reth.” He said the name with a strange, guttural roll in his throat. “I am King of Beasts. I am Clan Leader, and I am Alpha of WildWood.” Several snarls rose from the crowds behind him then, but he ignored them.

Elia swallowed as he leaned in until the scruff on his jaw rasped her cheek. “I am the King,” he said, “And you will be my mate.”

The forest behind him erupted.

A young Brave walked out of his village, gathered companions to his side, defeated the Great Demon King, became famous, then came back with beauties in hand! This was a legend that appears in the world of Seyrol every 200 years!

Our protagonist, however, isn’t a Brave. Even so, for over a thousand years his figure has loomed throughout its history.

Unwittingly, the name of the Red-robed Priest began to resound throughout the world. Red-robed Priest’s legend included extraordinary sword techniques and magic, erudite knowledge, and an almost prophetic ability to lead young Braves toward the proper path. People of the world think of him as a descendent of the ancient Yellow Race which led to his omnipotence. In essence, however, this was just the characteristics of the profession known as ‘Noble’.

- Description from Novelupdates