|"Our tradition, kukui oil. Try it on yourself, Kurogane."
"Wow, I've never seen oil like this before. I hope you'll teach me how to make it later."
Olive oil, sesame oil, pine oil, palm oil…… Oil is a staple of civilization, used for a variety of purposes such as "protection, illumination, and lubrication." In the past, the spread of culture depended heavily on the art of "how to collect and use oil." A discovery of different oils was a discovery of new techniques and wisdom. Here and now, a new world is born through the interaction between islanders and engineers. To put it plainly, it's a combination of sun and oil.