The Summer Hikaru Died, Vol. 4

Two boys grew up together in a certain village-Yoshiki and Hikaru. One day, Yoshiki became sure that Hikaru was no longer himself. He resolved to accept the new -Hikaru,- whatever happened to his friend. But now he-s decided to research the history of -Nounuki-sama- and Kubitachi to understand what this creature truly is. The situation evolves unpredictably, outside the boys- control. Who will make the next move, and what will they find?