Jibun Techo Mini Lite
I have to admit: sometimes I`m buying planners just because I`m curious about their paper!
Jibun Techo von Kokuyo was using Tomoe River Paper in their 2019 standard version and in their Idea notebooks.
The Biz version and their Life books were made out of MIO paper.
In 2020 they do not use Tomoe River Paper (=TRP) anymore but changed to their new THIN paper. Everything which was TRP in 2019 is now Thin paper.
Here is a very good explanation of this planner system on JetPens.