Aisaika Sugiru Scientist wa Kyuukoku no Eiyuu ni Naru

A chemistry teacher dies in an accident and is reborn as Roca, a farmer in a fantasy world. He has a loving and loyal wife named Arc, though he is a poor money manager who often gambles with her funds. Roca, who instantly falls in love with Arc, applies his chemistry knowledge along with a "purification skill" to address various challenges, aiming to bring her happiness. His efforts draw attention from the royal class, eventually entangling him in a conflict between nations.