The novel was inspired by the paintings of Japanese artists シッポ . I love the paintings of シッポ, I saw the word "Crude" when I browsed. My English is not good. I found out that the word has the meaning of "original、raw" adjectives and "crude oil" nouns. Innocently, I thought that the author wrote this word to express "draft". Later, I felt that the Chinese pronunciation (Yuan You) of the word was very cute, so it was used as the protagonist's name. It was only after I noticed the homepage of シッポ today that I found out that "Crude" was actually the name of a character he originally created. シッポ did not blame me, but instead collected my novels, which made me grateful and apologetic. I didn't mean to copy it,absolutely. I declare that this series of novels is purely for expressing my hobbies. Relevant characters and settings will never be written into the commission and will not be used for business. At the same time, I would like to express my deepest apology and gratitude to the Japanese artist シッポ.