After a soccer game, six kids head home and play a cute, RPG-style video game. When they beat a boss, something strange appears and pulls them into the game world. Tomoru, Mio and Dai land alongside Professor Galileo, who created the game, called Eureka, and was accidentally drawn into it himself. To return home they must clear missions that appear in different areas, and each one is a science problem. In area C-1 they face a rival team: another professor accompanied by Yukio, Suzuka and Kouta, their opponents from the soccer match. After learning how lightning forms, the group must find a way to stop it. Clearing a mission earns a Eureka Stone, but the gateway home will only open once they hold ten. The result is a comedic sci-fi adventure built around learning science.