Gates of Okinawa (沖縄の悪夢)

"In Okinawa, doors to hell open at the last bell"

Military spouse Zena Marlowe must be losing her mind. Her star students skip class, fights break out unexpectedly, and then there's the blood. A lot of it. That river of red thrusts her down a macabre path of madness.
When Zena and a group of students discover disturbing experiments at their school, deadly demons stir around and within them. Soon the gates of hell fling themselves open, unleashing otherworldly creatures from Japanese lore whose aims put Zena, her students, and all of Okinawa in peril.

As she struggles with her own fears and secrets, Zena's adventure takes her from tip to tip of the island in a sweat-inducing sub-tropical nightmare. She risks her career, relationships, life, and her very soul to confront the ghosts at the gates. Foreign and domestic forces pursue her and her allies at every treacherous step.

Deep in the caves, cliffs, forests and seas of 沖縄 night creatures of legend rise from eons of slumber - and they're hungry for the flesh of a new world. Can Zena survive Okinawa's supernatural invasion, or will she lose everything - including her final thread of faith - to the ユーリー that threaten to consume the island?

For fans of "The Ruins" by Scott Smith and "Ring" by Koji Suzuki. If you enjoyed "Uzumaki" by Junji Ito, "Gates of Okinawa" will keep you up all night!