A BCI controller that can detect brain signals and transport a person's consciousness to the virtual world of the Internet has gained immense popularity in the near future. Katsuro, who was apprehended for a specific offense, was taken in by police officer Yumeji and is currently serving his sentence while residing with his sister-in-law, Rin. But in return for reduced punishment as requested by his adoptive dad, Katsuro takes on the task of probing cyber offenses.