After Indulging in Alchemy, the Madam Was Cringed Over by the Duke

This is a fantasy world where angels and demons dance together, elves and dwarves play mahjong, and every imperial royal family member has a dragon.

In the Campbell black market, there is an "Alchemy House" whose owner sells various elixirs with miraculous effects.

"Do you have a potion that grants invisibility? I need to sneak into places where people like me are not allowed." [On sale...]}