Higurashi no Naku Koro ni Kizuna Volume II: "Sō" (ひぐらしのなく頃に絆 第二巻「想」 When the Cicadas Cry Bonds Volume II: "Idea") is the second installment in Higurashi no Naku Koro ni Kizuna. It first released on November 27, 2008 and was rereleased in a two-pack with Volume I on December 23, 2009.
Hirukowashi-hen was originally released with Higurashi no Naku Koro ni Rei as an extra arc. This Alternative version has several changes, namely the addition and removal of certain characters and removal of references to plot details not yet revealed in the Kizuna series.
This arc is based off of the Onisarashi manga and is the second arc in the Advanced Story. It once again centers on Natsumi Kimiyoshi and her friends living in Kakiuchi City, with the detectives Tomoe Minai, Mamoru Akasaka, and Kuraudo Ooishi investigating the Great Hinamizawa Disaster.