In 2040, the continuous discharge of global pollutants has caused severe pollution of seawater and coastal areas, making them no longer suitable for human habitation. As a result, humans have initiated an inland migration plan, and all coastal residents are moving inland to bid farewell to the sea; Akai and his girlfriend, who had never met before, made plans to meet at the beach where they lived. They explored each other's different lives, but were diagnosed with color blindness during the driver's license examination. At the same time, his girlfriend was forced to move away from the beach