Kinuko was married to her husband for many years, but her husband passed away. Since then, Kinuko has lived in the same home with her granddaughter Nagisa.
Musashi returns Japan's legendary swordsman and philosopher to the screen once again. In an original period drama based on the historical facts of the life and travels of the famous Miyamoto Musashi we find an apprentice, an instructor and the account of a famous battle in Japan of the Middle Ages where many questions will be answered.
Assistant Inspector Fukuie does not look like an assistant inspector but once she starts an investigation, she takes no notice of anyone as she searches for the key to find out the truth. She does not care for the hierarchical relationship of the organisation or career advancement. If she has doubts, she will not listen to her superior and will persist in investigating to the end. Fukuie’s boss Inspector Ishimatsu is completely different from her. He places importance on the organisation and discipline, is rigid and strait-laced. Ever since Fukuie became his subordinate, his pride has been in tatters because she loves to disregard his instructions and investigate on her own even though this eventually results in success and he gets credit for her achievements. His principle is to investigate using orthodox methods, but the results that Fukuie delivers goes against this and makes him feel ashamed.