Very cute. 
Google’s image search is quite helpful …
https://twitter.com/nishitanabeigo/status/1591744983203446784
Google-Translation there on Pfipper says this:
In today’s Children’s Go Room, we distributed cute files given by Mr. Tororo (@tororo2048) to the children. Everyone was very happy and quickly solved Tsumego. Thank you very much Tororo!
Maybe check out “Tororo”’s account in case he posted it there?
https://twitter.com/tororo2048/media
Or … politely ask him?
Please let us know what happens, will you?
I’d immediately purchase a book with these cute comics if it had English text!
Forgive me for replying to myself, but look here (I had to link directly to the page, the site seems to use old-school frames, so now you don’t have the nav bar):
https://tororoigo.web.fc2.com/clearfile2.html
碁石さんの囲碁ルール クリアファイル改訂版（Ａ４）
以前に作った囲碁のクリアファイルを、一部改訂し、増産しました！
後援 ： 一般財団法人 永井熊七記念財団 代表理事 永井一夫様
考案・制作 ： 関西棋院 白石京子先生
イラスト ： とろろ囲碁の簡単なルール説明をイラストにしたクリアファイルです。
囲碁普及のために作成したものですので、今回も販売物ではなく、配布品といたします。
Go Stone’s Go Rules Clear File Revised Edition (A4)
The clear file of Go I made before has been partially revised and increased production!
Supported by: Mr. Kazuo Nagai, Representative Director of the Kumanishichi Nagai Memorial Foundation
Invented and produced by: Kyoko Shiraishi, Kansai Kiin
Illustration: Tororo
It is a clear file with an illustration of a simple rule explanation of Go.
It was created for the spread of Go, so this time it will not be sold, but distributed.
(machine transl.)
You’re amazing! You found a photo… hm… this page that you shared looks a bit outdated, but I found some info that it was posted in 2022. This means that the information on that webpage should be quite accurate.
I translated more info:
If you live far away, please let us know the number of copies you want and the address below, and we will send it to you by Yu-Packet at the post office.
For Twitter: Please contact Tororo @tororo2048 by DM.
In the case of email: Please contact Tororo de@o.email.ne.jp .
*Please be aware that you will be charged a shipping fee of approximately 280 yen to 390 yen as a cash on delivery fee before applying.
- Basically, I try to reply, so if there is no reply, there is a possibility that I missed it. In that case, please contact us again.
*It will be sent by Kyoko Shiraishi to the address of Go Salon Senrioka.