In feudal Japan, Musashi Miyamoto must cofront Kojiro Sasaki on Ganryu Island, but he meets Arale Norimaki, Gatchan and Taro Soramame on the way. Musashi tries to impress Arale and her friends with his talents as a swordsman and his way to catch flies with chopsticks, but he fails miserably. Impressed by Arale's power, he asks her to take him as her disciple. Arale accepts and the gang brings him to the present. Musashi Miyamoto becomes a student in Midori Yamabuki's class, leaving Kojiro Sasaki waiting in the past for eternity.