The 2020 edition started selling notebook refils.
2020 edition, notebook refil
Direct (16×19.2) Size: 2,900 + Tax
A5 size: 2,900 + tax
B6 size: 2,500 + tax
Pocket (16.6×8.5) size: 1,800+ tax
The B5 size and A6 size will be finished with a good deal of effort.
I'm so sorry, but I'm sorry to understand how many strokes I'm going to do.