This book uses manga to explain tips on quality control methods that are difficult to understand for novices, such as the 7 QC tools and the concept of statistical quality control.

The main character Akari, takes a part-time job at a candle factory during her summer vacation and gains knowledge of quality control under the guidance of Ed, a Portuguese student she meets at work.

The book covers the definition of quality itself, statistical distributions such as 3σ and 6σ, international standards such as ISO9000 and HACCP, and modern procedures such as clean rooms that have been adopted for precision products.