Hikaru and Y/n are extremely close friends, sharing years of memories before the strange events begin. Y/n and childhood friend Yoshiki both care deeply for Hikaru, but only Y/n knows the terrifying truth — that the Hikaru everyone sees is not quite human. Aoi, a school friend of Y/n, remains blissfully unaware and unwittingly unsettles Hikaru whenever she’s near. As strange occurrences spread through their quiet town, Y/n struggles to protect both the secret and their fragile bonds.