Meguru Sekai de Towanaru Chikai o!

The Amazumi Shrine in the mountains had suffered a great fire, but has since recovered. The four sisters who live there, Akiho, Minatsu, Mafuyu and Harune, were battling apparitions for the first time when they met a strange man Nayuta, who did not remember anything but his own name. He joins them in their fight and helps them bring the shrine back to prosperity. But there seems to be someone behind the influx of apparitions...