"ISLAND" is a 12-episode anime series based on the visual novel by Frontwing. The story unfolds on a remote island called Urashima, which is shrouded in mystery and folklore. The protagonist, Setsuna Sanzenkai, washes ashore with no memory of his past. He is discovered by three young women: Rinne Ohara, Karen Kurutsu, and Sara Garando. Each of these characters plays a significant role in the narrative, which intertwines personal struggles with the island's enigmatic history.

Rinne Ohara is a cheerful and energetic girl who lives alone in a lighthouse. She is deeply connected to the island's traditions and is determined to uncover the truth about her family's past. Karen Kurutsu, the daughter of a wealthy family, is more reserved and pragmatic. She harbors a secret that ties her to the island's legends. Sara Garando, a mysterious girl who claims to be from the future, adds a layer of science fiction to the story. Her presence raises questions about time travel and the island's potential role in a larger, apocalyptic event.

As Setsuna integrates into the island community, he becomes involved in the lives of these three women. The narrative explores themes of memory, identity, and destiny, with each character's backstory gradually revealed. The island's folklore, particularly the legend of the "Time Traveling Girl," becomes a central focus. This legend suggests that a girl from the future will save the island from a catastrophic event, and the characters begin to suspect that Sara might be this prophesied figure.

The plot thickens as the characters uncover hidden truths about the island's past and their own connections to it. Flashbacks and revelations about their lives before Setsuna's arrival add depth to the story. The series balances moments of lighthearted interaction with darker, more suspenseful elements, creating a narrative that keeps viewers engaged.

The climax of the series involves a race against time to prevent the predicted disaster. The characters must confront their fears and make difficult choices, leading to a resolution that ties together the various threads of the story. The ending leaves some questions unanswered, inviting interpretation and reflection on the themes of time, memory, and the impact of individual actions on the future.

"ISLAND" is a blend of romance, mystery, and science fiction, with a narrative that weaves together the personal and the fantastical. The series is characterized by its intricate plot, well-developed characters, and the atmospheric setting of Urashima Island, which serves as both a backdrop and a central element of the story.