陰と影 ​～那月島鬼祭記～

Natsuki, an ominous island where the descendants of oni live.

The current head of the family, Natsuki Shino, hires bodyguards from various places in order to protect the upcoming "Matsuri" from the Wakou.

Rumors of the man who cursed her, Futatsukage Sougen, was among them reach the girl, Muinsai Sora.

The girl crosses over to the island by herself to begin her search. However, in the midst of investigating the island, a dreadful secret surrounding Natsuki is discovered.

Furthermore, an abnormal situation arises where the strong that have gathered on the island are being gruesomely killed off one after the other!

Will Sora manage to break the curse and safely escape the island...!?

[rough translation taken from Kamabokoheights official website]