Rasen Sokou no Dystopia -The Infinite Set of Alternative Version | 螺旋遡行のディストピア -The infinite set of alternative version-

Protagonist Kou descendant of lineage that manages declining Shinto shrine. Azusa and Yurina of childhood friend who lives in neighboring house, with best friend Souma, every day was spent while being worry only just a little in the future.

A certain day when summer vacation approached, it is a girl Miu of alone in the class of Kou. And Kou which saw Miu which loitered around in the evening asked her what you were doing.

[Something is looked for. Very old book. Somewhere in this town... a certain one.]

The book, the one that had been kept in the Shinto shrine that the house and the Oosakaki person of Kou were managing for years. When you obtain it, with lightning, the reason in the world begins to move.