Complete details for the single are available and the song grew on me so I’m mentioning it. I still think it’s not very fitting for Higurashi, though. ^^ The song is the opening theme to the 2nd Higurashi DS game. December 3, 2008 release.

「 プレイス・オブ・ピリオド 」
Place of Period
 

Mio Isayama
2008.12.03 : FVCG-1061
  01.
02.
03.
04. 		プレイス・オブ・ピリオド
半分だけの愛
プレイス・オブ・ピリオド （off vocal)
半分だけの愛 （off vocal)