The protagonist, Kagami Renka, moved to the remote country town of Hasumi-mura due to his stepfather's new job. Renka intends to find information about his real parents after hearing that Hasumi-mura was his mother's hometown. Renka's mother died when he was young, and he never knew who his true father was.
While taking a stroll shortly after arriving in the village, Renka discovers a Shinto shrine partially submerged in the water. Since the first thing anyone does on finding a creepy shrine in an unfamiliar area is explore it, Renka enters the shrine. Poking around in the altar room, he finds a mysterious doll tied up with numerous chains. Feeling that something is not quite right, Renka attempts to leave the shrine as quickly as possible, but not before the appearance of a girl in a white dress. "Who are you?"
Making friends at his new school, he gradually opens up to them about his intention to search for information about his true parents. The days pass, and when the full moon comes, he learns of a legend particular to Hasumi-mura: an event that takes place every 44 years. Again, he meets the girl in the white dress who calls herself 'Amane', while walking along the beach. She tells him that they should not meet, but agrees to tell him about the festival and the strange deity it honours if he meets her at the shrine after the festival.
After the festival, Renka continues to search for information about his parents with his new friends. As the moon wanes, he learns more about the village, the legend and the mysterious 'Hasumi' family that historically presides over Hasumi-mura.
The new moon approaches and Renka starts to uncover an insidious web of tradition and deceit involving many of the families that live in Hasumi-mura. His friends begin to disappear and, too late, Renka learns of the true nature behind the ritual the village practices every 44 years.
When the moon disappears, everything comes to an end.
[From Asceai's Review]