How Could a Genius Witch Like Me Be a Shopkeeper?

"Ah, I'm dead... Just kidding, I'm not dead. Ehehe~"

"Hurry up and decide what you want to buy! It's your good fortune to have run into me, miss. People who keep being picky won't find happiness!"

"I'm a witch, the greatest space-time witch in history!"

"I told you, I'm human! I only turned out like this because this is the only kind of creature in your world that can withstand my magic!!"