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.

After recently moving to the rural village called Hinamizawa, Maebara Keiichi joins a club and makes new friends. He soon learns about the village's dark secret, Oyashiro-sama's curse, where one person dies, and one person disappears every year, and he also learns that his friends might be behind it...

After moving into the quiet town of Hinamizawa, Maebara Keiichi spends his days blissfully in school often playing games with his local friends. However, appearances can be deceiving. One fateful day, Keiichi stumbles upon news of a murder that had occurred in Hinamizawa. From this point on, horrific events unfold in front of Keiichi, as he soon learns his close friends may not be all that they seem. Based on the amateur mystery game by 7th Expansion, the story is told in a series of different scenarios. 
Onikakushi is the first in a series of manga following the different scenarios of the Higurashi games. It focuses on Maebara Keiichi's arrival to Hinamizawa.

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