That time i got reincarnated as a slime, vol. 5 (manga): the ways of the monster nation - Sho Okagiri

Framea's hard at work on the next part of her Tempest Guidebook, but the costs of conducting research are continuing to compound! Luckily, Rimuru has just what she needs--a convenient card that can be used in place of cash.

But Framea soon finds that resisting the many temptations of Tempest is a tough task.

and with a little encouragement from two troublemakers, she sets off on a spending spree that may just bankrupt her bewildered boss!.