Everyone here is saying shopkeeper scammed the slime, but the Shopkeeper probably lost money since slime only had enough money for candy and even broken weapons can be worth money as scrap iron
This isn't Isekai One Punch Man, One Punch Man was funny. This isn't Isekai Death Note, Death Note was a more of a thinking manga... This one is ... very dumb so far, Overpowered protagonists, no real enemy scaling, everyone other than the MCs are/have become "Evil" just because. Not gonna...