There is a boy who prefers a solitary journey, Tsubaki Iori. A boy who had given up on love, living his life without being deeply connected to anyone, always has been and always will be, for the rest of his life. He truly believed it and came to accept it.

Until that time, when he met "her"―

On a remote island that he happens to visit, Makura-jima. A place that should have no connection to him, yet Iori receives an unexpected hospitality. If anything, he seems to have a connection with the god of the island, Watatsu Mizuchi, and his arrival is said to be a predestined fate. Even though Iori does not believe such a wild story, he heeds the wishes of the islanders, deciding to stay until the Housensai Festival.

While on this island, Iori becomes involved with three people who share with him, a "connection."

An overly familiar, yet mysterious young man―Shidara Asuka.
A girl, despite being filled with gloominess, shows genuine affection only to Iori―Saeshiro Misumi.
And, the signboard girl of a lively guest house and the "Priestess of Mizuchi"―Minato Shizuka.

All of them, like Iori, bear peculiar birthmarks on their bodies.

Waiting for the boy, an incomprehensible sense of déjà vu, "connections" that could not be a coincidence.

Eventually, the boy would realize.

That this encounter is a culmination of the curses and sentiments weave together for a thousand years.

[Translated and edited from the official website]