"Jigoku Sensei Nube: Kyoufu no Natsu Yasumi! Ayashi no Umi no Densetsu" is a supernatural horror anime that centers around Meisuke Nueno, a teacher with a demonic left hand sealed by a mystical glove, granting him the ability to exorcise evil spirits. The story unfolds during a summer vacation when Nube, along with his students, visits a remote island for a school trip. The island is shrouded in eerie legends, particularly one involving a cursed sea and a mysterious ghost ship that appears every 50 years.

The narrative begins with the group arriving on the island, where they encounter strange occurrences and unsettling locals. The students, including the curious and brave Ritsuko Takahashi and the mischievous Miki Hosokawa, quickly become entangled in the island’s dark history. The legend of the ghost ship is tied to a tragic event involving a young girl named Sayaka, who drowned at sea decades ago. Her restless spirit is said to haunt the waters, seeking vengeance.

As the students explore the island, they uncover clues about Sayaka’s death and the curse that plagues the area. Nube, using his demonic powers, investigates the supernatural phenomena, confronting malevolent spirits and unraveling the truth behind the ghost ship’s appearance. The story delves into themes of loss, guilt, and the consequences of human actions, as Nube and his students work to break the curse and bring peace to Sayaka’s spirit.

The anime blends horror with moments of humor and camaraderie, balancing the tension of supernatural threats with the dynamics of the teacher-student relationships. Nube’s protective nature and his willingness to risk his own safety to save his students highlight his role as a mentor and guardian. The series maintains a focus on the mystery of the ghost ship and the emotional weight of the island’s history, culminating in a climactic confrontation that tests the resolve of both Nube and his students.