Doujinshi.org - https://www.doujinshi.org/book/1550089/

Suruga-ya - https://www.suruga-ya.jp/kaitori_detail/ZHOTI22472

Artist - Setsuko (セツコ)

Setsuko katakana, same as hirigana <- See - https://www.doujinshi.org/browse/author/36801/Setsuko/

Alias: Katou Setsuko (加東セツコ) (かとうせつこ) <- Name from - https://www.chil-chil.net/authorDetail/author_id/2331/

Seems to use Pen Name: Katou Setsuko for commercial work

Circle - Xiaoqu (小区) <- Name present - https://www.doujinshi.org/book/1549567/

Other Circle - Shiro Note (しろノート) (シロノート)

Shiro Note katakana from - https://www.doujinshi.org/browse/circle/19222/Shiro-Note/

Katou Setsuko Home Page (Entry) - http://kayomi.saiin.net/

Katou Setsuko Home Page - http://kayomi.saiin.net/o/index.html

Setsuko Pixiv - https://www.pixiv.net/member.php?id=2105635

Setsuko Booth - https://shironote.booth.pm/

Setsuko Twitter - https://twitter.com/mameo_mame3

Katou Setsuko Twitter - https://twitter.com/setsuco_k

Base +47, TheGreyPanther +57