Note to the namespacing and renaming contributors: Honami signed as Honami Aya for this work.
All 4 artists have one signature page at 36-39.

04-11: Urutsu (ウルツ)
12-15: Kosori (こそり)
16-19: Honami Aya (ほなみ彩)
20-23: Honami Aya
24-27: Urutsu
28-35: Meno (めの)

Signature "guest page" and afterword
36: Urutsu
37: Kosori
38: Honami Aya
39: Meno

Groups involved (41-42)
Honami Aya from circle Yotsukuro (ヨツクロ)
Meno from circle Aoi Hologram (蒼井ホログラム)
Urutsu from circle Stratosphere (ストラトスフィア)

Kosori from circle Fuuryuu Kitan (フウリュウキタン) not included on page 41.

https://www.melonbooks.co.jp/detail/detail.php?product_id=25605
Thanks for sharing, lanslort!

Base +29, Shiro Akisu +15, yuri25 +1, Bane13 +34

@Luna_Flina

Thanks for the information!

I put ほなみ彩 as Honami because this was her former artist name (like in /g/718031/239b32daff/), I think using the old one would be easier for searching purpose. Also this collaboration fan book is sold at the circle Aoi Hologram in the event so I only add this one here (And adding all of the circle names would make the title too long)

Base +6

http://www.doujinshi.org/book/709449/

Base +58