Since 2007, the company has been selling the "ReEDEN" series of paper products using the Yoshi from the Lake Biwa / Yodo River system, because the utilization of Yoshi leads to environmental maintenance such as water purification and ecosystem conservation. It is said that this collaboration was realized because the venue of the 2015 National High School Comprehensive Cultural Festival is Shiga, and the production factory of KOKUYO's campus notebook, which is also celebrating its 40th anniversary this year, is located in Shiga.
There are two types of notebooks to be released, semi-B5 size and A6 size. Yoshi is used for the inner paper of the notebook, and both sizes express the charm of Shiga with different front and back cover colors and unique attached stickers.
The semi-B5 size expresses the depth of "Biwako" with two shades of blue. The inner paper has ruled lines that can be used regardless of the top and bottom, and it is said that it can be used from either the left or right. The price is 160 yen (excluding tax, the same applies below).
On the other hand, the A6 size comes with a front and back cover color that colors the scene of "Shiga's season" and a unique sticker that expresses the charm of Shiga in that season. "Yoshi no Oto", which has the image of winter, uses Yoshi paper that retains the texture of Yoshi on the cover material, and comes with a sticker designed for Yoshi cutting, which is a winter tradition. The inner paper contains a one-point pattern of "Biwako", and the pages can be separated with perforations. The price is 120 yen.