Hyakki: The Secret of Devil's Island

A tour group of young adults journeys to a mysterious, deserted island, once home to a thriving city now in ruins. Each member has a personal motivation for the trip, ranging from revisiting their former homes to participating in a scavenger hunt. As they explore the decaying structures, unsettling events begin to unfold, accompanied by the surfacing of past memories and the emergence of sexual emotions within the group. The idyllic tour takes a dark turn when several tourists are found murdered, indicating that someone, or something, remains on the desolated island, posing a deadly threat to the remaining visitors. The anime explores themes of isolation, the past, and the hidden dangers of a forgotten place.