It’s an “Higurashi no Naku Koro ni” anthology series, released by Softgarage.

The volumes contain the following chapters:

Volume 1: (2005/7/29)

#Cover illustration: Ikegami Akane
1. #Illustration: Azuma Yuki
Cherish: Anata wo Aishete (Cherish〜あなたを愛して〜) by Majika
2. #Illustration: KAhara Nanami
"Shoseiki" no Nazo wo Abake! (「諸世紀」の謎を暴け！) by Yotsuya Masamune
3. #Illustration: Uchimura Kaname
Hasami wa kami awazu, shikashi surudoku kirisaku (鋏は咬み合わず、しかし鋭く切り裂く) by Yagami Keiichirou
4. #Illustration: Izumi Rei
Hito Oni (人鬼) by Touya Rizuki
5, #Illustration: Nanami Ayame
Ooishi Keiji no Sousa Memo (大石刑事の捜査メモ) by Moriyasu Hiroya

Volume 2: (2005/11/14)

#Cover illustration: Kyourin Takanae
#Illustration authors: Takatori Umi, Takehito Mizuki, Mori Keiji, Amou Mari and Maruchan..

Volume 3: (2006/2/15)

#Cover illustration: Azuma Yuki
#Illustration authors: Izumi Rei, Uchimura Kaname, Nanami Ayame, Azuma Yuki Nanami Kahara.

Volume 4: (2006/5/25)

#Cover illustration: Kyourin Takanae
#Illustration authors: Takatori Umi, Takehito Mizuki, Mori Keiji, Amou Mari and Maruchan..

Volume 5: (2006/8/25)

#Cover illustration: Ikegami Akane
#Illustration authors: Azuma Yuki, Uchimura Kaname, Kirishima Riona, Kahara Nanami and Suihei Kiki.

Volume 6: (2006/11/24)

#Cover illustration: Kyourin Takanae
#Illustration authors: Takatori Umi, Takehito Mizuki, Mori Keiji, Amou Mari and Maruchan.

Volume 7: (2007/2/23)

#Cover illustration: Ikegami Akane
#Illustration authors: Izumi Rei, Uchimura Kaname, Riona Kirishima, Kahara Nanami and Chiha Ayami.