Invasion from Another World: My Guardian Spirit Is a Talented Jiangnan Beauty

[New author; the author is still learning and is a student, so updates are irregular] [One female lead + transmigration + no System + guardian spirit + fictional world, please don’t compare it to reality + angst + academy]

A rift over the Atlantic Ocean opened the way for an invasion from another world. Humanity entered the Otherworld Era. As people were driven back step by step, some awakened guardian spirits, giving humanity the chance to strike back against the invaders.

Our story takes place a hundred years after the invasion. A mercenary from another world is brought to this one by an accident and becomes a baby in swaddling clothes. He, too, will leave his mark on this world.

(The early part focuses mainly on school romance; the middle shifts to passionate battles.)