Possibly the Greatest Alchemist of All Time

Iruma Takumi is swept into a hero summoning, even though he isn’t a hero. Mistakenly transported to Mildgard, a fantasy realm of swords and magic, he’s offered a chance to start over. While he longs for a peaceful life, the goddess Nolyn grants him 'alchemy,' an ultra-powerful skill that lets him create anything—from holy swords to flying ships. His reluctant adventure begins!