The closest to you is the real "Koupen-chan's World".

The second original picture book of the character "Koupen-chan" who gives courage with lovely works and gentle words!
The author, who continues to paint almost every day, completes a total of 148 original drawings that he has been trying to draw steadily since 2019. This is the latest collection of works that cover daily support illustrations that have received a great response on Twitter, single pictures that attract people with detailed background descriptions and worldviews, calendar illustrations, and unpublished works on SNS.
A book where you can enjoy analog paintings of pale and soft colors at home.

CHAPTER 1 The World of One Pictures
CHAPTER2 Kopen and his friends
CHAPTER3 Delicious rice
Travel with CHAPTER4 Kopen-chan
CHAPTER5 Kopen-chan's Chronicles
CHAPTER6 Kopen's sir~
CHAPTER7 The World of Kopen-chan
★You can read the secret story of the author's drawing for each chapter.