It's love and loss that lead Arthur Brennan, across the world to Japan's Aokigahara, a mysterious dense forest known as The Sea of Trees lapping the foothills of Japan's Mount Fuji - a place where people go to contemplate life and death. Arthur enters the depths of the forest and loses himself beyond the guiding ribbons threaded through the trees by many before him.

Having found the perfect place to die, Arthur encounters Takumi Nakamura, a Japanese man who also appears to have lost his way. Unable to leave Takumi behind, Arthur invests all of his remaining energy into saving Takumi and returning him to safety.

The two men embark on a journey of reflection and survival, which affirms Arthur's will to live and reconnects him to his love with his wife.