This anecdote had been told among disciples of Niten Ichi-ryu in the Hosokawa domain as a fact which Musashi had often spoke about while he had been alive; Masanao TOYOTA recorded it in "Buko-den."
この説話は、武蔵が度々語ったものとして当時の細川藩の二天一流の門弟間に伝えられていた伝聞を記録したものである。