葉庭(はにわ)の出店(でみせ)(Haniwa’s Store) is a dōjin circle run by an artist calling himself Haniwa, or Leaf Garden. He’s been active for a very long time.
The circle mostly produces touhou-centric content; notably the series Miko Miko Suika, and a three-parter called Thought of Dolls. Besides that, he took part in an official touhou anthology manga at one point.
Haniwa’s most recent blog post is from 2019, so it’s unclear (to me) whether he’s still active.

• Miko Miko Suika

• Haniwa's blog
• Touhou Wiki entry on Haniwa's Store
• Touhou Wiki entry on Haniwa
• The literal translation of 葉庭(はにわ)(Haniwa) is Leaf Garden, hence the banner.
• The banner is from his blog.