The project focuses on various anthropomorphism Sega consoles, known as "Sega Hard Girls" or "SeHa Girls" for short, each with their own unique personalities. The anime series follows three such girls; Dreamcast, Sega Saturn, and Mega Drive, who must graduate from Sehagaga Academy, a special school located in Haneda, Tokyo, by venturing into the worlds of various Sega games and earning medals.