These swords were required in court ceremonies, and after the era of wanto (curved swords, Japanese swords in a strict sense), from the late Edo period through Meiji and Taisho periods to the early Showa period, they were created with slight changes added over the course, although much decreased in number.
これらは宮中の儀式に必要なもので、弯刀（わんとう反りのある刀、狭義の日本刀）時代に入ると、反りが付くようになるなど、若干の変化を加えながら、江戸時代末期から明治、大正、昭和初期に至るまで、少数ではあるが作られ続けた。