Vanir has a proposal for Kazuma.

"Actually Kazuma, I thought we might be able to help each other out?" Vanir asked Kazuma, getting the reincarnated Adventurer to blink.

"...a potential deal with a Devil... What has my life become?" he deadpanned, getting a chuckle out of Vanir.

"Nothing nefarious, I assure you. While your soul is indeed quite interesting, it's not what I want, if that's what you're afraid of," Vanir assured Kazuma. "Rather, I think we can exploit a certain detail about you for mutual benefit..."

"...yeah? What's that?" Kazuma asked, remaining wary.

"Why, the fact that you are from another world of course!" Vanir declared. Kazuma's eyes widened, but before he could try to deny it, Vanir held up a hand to forestall any such attempt. "Now now, don't try to hide it, my all seeing eye doesn't lie to me... And worry not, for I will not use this information against you..."

"Okay... So what do you want to use the information for?" Kazuma asked.

"Why, to help with the shop of course!" Vanir replied jovially. "I imagine there are things that exist in your world that don't exist here, no? From what I can see in your mind, your world is much more advanced than this one! What I suggest is that you make some useful items that haven't been invented here, and this shop can sell them! We can rake in the money with this! And of course, you can take a decent cut of the profits yourself!"

"...that doesn't sound like a bad idea," Kazuma said. "Just one issue... I'm not that handy..."

"That's not a problem! You can have the local Blacksmith teach you the "Smith" skill! It makes you better at crafting all sorts of things! You can even start small! So what do you say? You wanna do business with us?" Vanir asked, extending a hand.