Three girls meet for the first time at the start of a new semester in a brand new school.

But these aren't just any girls, and this isn't just any school! Dreamcast, Sega Saturn, and Mega Drive might be the names of SEGA gaming consoles, but at Sehagaga Academy, they're also three girls destined for greatness, or at least a nostalgia trip. Wacky hijinks ensue when the girls are tested not on their math and science skills, but on their ability to complete challenges inside (literally!) classic SEGA video games. Can they fight their way through the blocky polygons of Virtua Fighter? Can their dance moves get them high enough ratings in Space Channel 5? And that isn't all! More challenges await on the road to gaining 100 medals in order to graduate, but the Sega Hard Girls won't let something like absurdity keep them down!