If you're looking for manga similar to Schoolgirl Strikers: Novel Channel (Light Novel), you might like these titles.
Set in 2045, humanity struggles to survive in a world overrun by mysterious invaders called the Irousu. The Earth's only hope lies with the students of Shinjugamine Girls' Academy, a school where Star Guardians train to fight the Irousu. Together, these brave girls work to develop their skills to fight against the invaders… provided they can pass class first!
In a land of swords and magic, there was a creature—an evil god—with extraordinary power. People feared its existence, but at the same time were captivated by its power. They wanted that power. Their dangerous wish would eventually lead them to break the evil god’s horn and create “Shinkaku Gikou,” huge magical weapons infused with the horn. One of these weapons alone has enough strength to overpower an entire country and its army, and there are 10 of these across the vast continent. However, one day a severely injured Moebius, the strongest Shinkaku Gikou user, entrusted his “power” to a young boy named Miyabi who happened to be present.