In the "Floating City" where memories can be stripped, stored and traded, a man codenamed "Zero" wakes up in an illegal human body clinic with no possessions and no memory. He is a complete "empty shell". His only clue was a cold beluga pendant in his hand. In order to find the answer to the ultimate question "Who am I?", He embarked on a dangerous journey. He will deal with the mysterious memory dealer "Crow" to explore the secrets of the sinking area, and gradually discover that his erased past is not only related to his own destiny, but also affects the foundation of this city built on forgetfulness. He was once an island of memory, but now he is sailing into the angry sea of forgetfulness.
