In the near future, memories can be deleted with precision. The top "cleaner" of the "Memory Clinic" - codenamed "Zero", is known for his calmness. He wanders through the broken memories of clients and erases their pain. He is like an island, cut off from all emotions. Until a mysterious woman named "Vi" arrives, her request is not to erase the trauma, but to completely forget a person. When Zero dived into her memory as deep as the sea, she found that the tides and storms in that sea echoed with her forgotten past. The target he wants to clean up seems to be himself. This isolated island is about to be swallowed up by the forgotten ocean.
