Maryoku Cheat na Majo ni Narimashita: Souzou Mahou de Kimama na Isekai Seikatsu

Looks like I've been reincarnated into a gamelike world filled with monsters and dungeons. But don't worry—it's nothing I can't handle. I chose Creation Magic for my unique skill, you see, and it lets me make whatever item I want...so long as I've got enough mana. Ah, there's always a catch, isn't there? But where there's a rule, there's a loophole—and this little witch knows just the trick to expand her mana pool a bit more each day.As for what I'll be up to in the meantime, first I'll make a friend. (Literally. Golems are a thing in this world.) Next, I'll make some tracks. (And the sooner, the better. The goddess dropped me off in the middle of the wastelands). Then finally, one day, I'll make myself a place where I can truly belong. (That's the plan, at least.) Time to make some magic!

(Source: J-Novel Club)