A review by moggmogg
The Summer Hikaru Died, Vol. 4 by Mokumokuren

5.0

getting some clues as to what "Hikaru" is. Discovered that the impurities are coming down from the mountain b/c they are drawn to "Hikaru"  but he is not an impurity. Yoshiki meets Tanaka and then later Tanaka helps the boys when an impurity attacks them at old man Takeda's.