Possibly the Greatest Alchemist of All Time

Iruma Takumi finds himself caught up in a hero summoning, even though he's not a hero; summoned by mistake to Mildgard, a fantasy world of swords and magic, Takumi is given a chance to start over.

Iruma Takumi finds himself caught up in a hero summoning, even though he's not a hero; summoned by mistake to Mildgard, a fantasy world of swords and magic, Takumi is given a chance to start over.