Senshukai Japanese-style fitted sheet, single size

Japanese-style fitted sheet, single size.
Unused, but has been stored for a long time.
Thank you for your consideration.

Addendum

Although unopened, this is likely a one-touch type.

I also have an unused, opened semi-double size (140x210 cm) fitted sheet. It's difficult to refold it neatly, but if you'd like to use them together, I can add it for an additional 500 yen and adjust the price. Would you be interested in a set?
Thank you for your consideration.