In the near future, memories can be stripped and transferred. Tokawa is a "memory ferryman" who makes a living by absorbing the painful memories of his clients, but his own past is blank. He is like an island, carrying the remains of countless sunken ships, floating in the sea of oblivion. Until a mysterious woman named Lin Yin brought a memory that could not be "digested" - a broken lullaby. This piece of music is like a key, beginning to unlock Tokawa's dusty past. In order to save himself and find out the truth, he had to dive into this dangerous memory, only to find that his fate and that of Lin Yin were already tightly intertwined in a forgotten tragedy.
