Higurashi no Naku Koro ni (ひぐらしのなく頃に, When the Cicadas Cry) is the opening theme of the first season of the anime. The song is the first single of Eiko Shimamiya under I've Sound and Geneon Entertainment label. Released on May 24, 2006 and reached #18 in the Oricon weekly charts. It has sold an approximate total of 35,000 copies and stayed in the charts for 26 weeks making this Eiko's most selling and longest charting single to date.