Tired with practice, I thought about raising money to buy magic liquid metal.
The most plausible thing right now, was making mayonnaise.
This world doesn't have mayonnaise.
If it's that seasoning that spawned the word『mayo lover』, selling it should certainly become a hit.
There are eggs, vinegar, and oil, so making it wouldn't be difficult.
The problem was the lack of initial capital.
No money with to earn money with... the『key to the safe』, to speak off.
Opening the safe requires a key, and the key is inside the safe—something like that.