Aoi, a young man with severe insomnia, visited a chat box of an old band fan group out of curiosity, and was surprised to see that a man who calls himself 'You' (ヨウ) reach out to him. The two men got along strangely well and their bond deepened. One day, when Aoi told You about his insomnia, You suggested that Aoi should sleep in his apartment. Slowly, the two of them become increasingly dependent on each other, as if they are each other's replacement for someone who had been lost...