A Certain Scientific Railgun OVA

A 13 year old girl with superhuman strength and a cute singing voice confronts a group of terrorists when the cops are afraid to.

From the beginning of all, there were battle gods called "Gourikishin" who team up with human partners they revere as "Oyakata" as they go through battle called "Kamizumo". Now in the present, an elementary student named Dai Mugen encounters one god name "Koutetsu" who fell from the sky and ask, "Please become by Oyakata and together let's kamizumo!!"

The Sablum Empire has been attempting to take over the kingdom of Windland for many years, and are now plotting with the mercenaries Sister Hell and Darkness Knight to start a new offensive using powerful magical beings called Angels. Hyaweh, a carefree yet talented swordsman, and Priecia, who just might be the lost princess of Windland, are enrolled at the Knight's Academy in Windland to hone their skill at swords and sorcery. There they meet many friends and allies who can help them protect their homeland from the impending invasion.

Following Gutsy Galaxy Guard's victory over the Zonder Empire and the 31 Primevals, a new threat makes their appearance on Earth. GGG - with Guy Shishio and the newly-constructed GaoFighGar - team up with their French counterpart Chasseur to battle the evil organization BioNet. Among Chasseur's ranks is Renais Cardiff Shishioh - a former BioNet cyborg with the relentless pursuit of destroying those who took away her humanity. But as GGG and Chasseur fight the BioNet, GGG's bases around the world are suddenly attacked, and the recently-discovered "Q-Parts" and the original Gao Machines are stolen by Mamoru Amami, who has been abducted and cloned by an even greater threat known as the "Eleven Kings of Sol." Evicted from Earth by the United Nations, GGG must now travel to the far reaches of the galaxy to battle the Eleven Kings of Sol and save Mamoru before it's too late.

Best friends and partners Miyuki Kobayakawa and Natsumi Sujimoto, along with the rest of the gang at Bokuto station, confront a motley group of offenders ranging from hi-tech panty thieves, purse-snatchers, and traffic violators. Using Miyuki's driving prowess and tech knowledge, as well as Natsumi's spunk and strength, the duo at times must resort to unconventional methods to see that justice is served.