If you're looking for anime similar to Gakuen Soul Guardians!? (Light Novel), you might like these titles.
This is the story of the mysterious creature Nulu-chan, and the boy who Nulu-chan keeps following around.
One day, on his way to high school, student Junpei picks up an unusual looking rock. Thinking nothing of it, he heads to class. While in the middle of a session, the rock comes to life and transports him and four others to an animated world! To make matters more interesting, the group is introduced to a giant sphinx who is determined to take over the world! Now, to protect their world from invasion, the group must work together as anime characters and real-world humans!
It is the early 20th century, in a time when Japan was wracked by war and bombings which seem to never end. In order to protect its citizens, the military has sponsored a special academy for young ladies to harness their virgin energy, a special fighting power possessed only by, you guessed it -- virgins. With this newfound power, these bashful women have the power to defend Japan from invaders! That is, as long as they can keep their pureness intact!