Mingyi is a concept in the Book of Changes, which means darkness descends and the world falls into chaos. In a world close to the time of Chinese legend, there are two gods representing Yin and Yang (light and darkness), the King of Wood and the King of Gold. After ten ancient suns perished, the gods disappeared from the earth, until a thousand years later, the witch destroyed the sun and tried to resurrect the golden king of the undead goddess. This is a story about the adventures of a group of teenagers with different personalities.
The world is deep and wide place. In order to know more about it, the Sky State Central dispatched the investigators Yoki and Shuka to conduct investigations around, and they do so while being very passionate and loyal about their work. This is a story of Yoki who wants to know more about the world and Shuka who loves the world. A slightly mysterious story weaved by these two people traveling around the world, meeting people, and sometimes even solving mysteries. "It sounds like it's going to be an amazing story, isn't it, Yoki?" "I wonder about that. I don't mind as long as Shuka-senpai is working seriously." (Source: Kadokawa, translated)