I Am the Only One in the World

The author declares in advance that "there are many mythological references in this book. Some parts may be wrong or modified by the author. Please do not criticize." The world view is very large and can be mainly divided into the mainland chapter, the Kyushu chapter, the upper world chapter, and the mortal chapter. Among them, the protagonist is not a completely good person. He is very vicious and decisive in killing.