The year is 2027. In modern day Tokyo, people can freely enjoy use of the internet as a result of the widespread availability of the Ethernet across the world. In all aspects, this is considered a modern communication revolution.

The revolutionary cloud operating system, known as ESC-A, has spread wildly among Japan's youth along with the internet. The video game software that comes preinstalled on the OS is Phantasy Star Online 2, known colloquially as PSO2. Although a critical success and testament to the modern era's communication revolution, the game is currently under the review of Seiga Academy and is in danger of being banned for negatively affecting students' grades.

Rina Izumi, president of the academy's student council and "once in a decade stand out student," is on a mission to provide counter evidence to prove that PSO2 does not cause students to neglect their studies. She recruits Itsuki Tachibana, a typical student that makes average grades, as vice president in order to be her prime affirmation to this stance by having him write daily reports on his findings in PSO2, while also maintaining his grade point average, attendance, and fulfilling responsibilities that come with being a member of student council.