My Quiet Blacksmith Life in Another World manga volume 1 features story by Tamamaru and art by Yoshino Himori.

Eizo Tanya is a burned-out, middle-aged, software engineer. One night after working late, he throws himself in front of a speeding truck to save a cat. Although the cat survives, Eizo is not so lucky. In a spark of divine fate, the cat turns out to be a godlike being who offers him a second chance in another world! Does he ask to be a legendary warrior? A noble king? Nope! All Eizo wants is a peaceful life making things for others, and what better way to do that than becoming a blacksmith? He does have one other stipulation: a cat companion for his quiet life. His requests are granted... but with a twist! Eizo's blacksmithing skills are so overpowered that they're practically cheat abilities. On top of that, the cat companion he wished for turns out to be a half-tiger girl! With so much commotion in this world, will Eizo be able to forge a quiet life?