My Otherworld Struggle Chronicle —Giant Killing—

A magical realm where whales fly through the sky, cats breathe flames, and frogs fire bullets. A man bearing the memories of twenty-first century Earth was born into such a world. After spending long years in battle, he obtained the title of strongest in human society and great fame. Yet now, he lives a primitive life in the forest. Having become a wanted man after killing his boss, he fled into the woods, spending his days doing nothing but fighting beasts. Tired of his monotonous existence, his life begins to move again when he encounters someone fateful.