Recettear, but with a cute girl from the human village instead. You sell stuff, hire Reimu, Marisa, or Sanae to collect treasure for you, and may even open up the shop "at night" to serve youkai customers.
However, disappointing youkai customers by not having the items they want may trigger a "youkai raid" scenario where you have to barricade the shop and ward off the offended youkai until Reimu or Keine arrive to save your sorry ass.
Another issue is that youkai, generally speaking, pay much better for those artifacts that you do have, but dealing with them too much increases an in-game suspiscion meter, which negatively affects the number of humans customers you get during daytime and, at worst, may even get you a non-standard game over by virtue of having your sorry ass kicked out of the village.
Gods may also play a role - you can pray to Kanako, the Aki sisters etc. and receive certain boons from them, but the gods demand sacrifice, and not giving them the items they want results in you getting cursed. And that's before you consider the risk of Jo'on and Shion showing up in your store.