This article explores the superstitions and beliefs about luck and misfortune in Japan, particularly numbers which are thought to be either lucky or unlucky. It examines the history of this concept, as well as four (四), nine (九) and thirteen (十三), which are commonly considered unlucky. Additionally, it looks at other numbers such as twenty-two (二十二) and forty-two (四十二) that are seen as unfortunate due to their phonetic similarity to certain words. In conclusion, four is likely seen as the unluckiest number overall due its phonetic similarity to “death”(死).