What is "dogatana"

Dogatana is a 1981 album by Japanese jazz guitarist Kazumi Watanabe. As usual for Watanabe, it features many acclaimed musicians. The album, compared to other Watanabe works, has a very acoustic sound and is characterized by peculiar guitar "duets".

It was released on Columbia Records, then re-released many times. The sleeve reads: "This album is dedicated to the memories of Akira Aimi".