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

[New author, the author will grow, the author is a student, updates are not fixed] (Single female protagonist + time travel + no system + guardian spirit + fictional world, please do not substitute into reality + knife + academy) The rift in the Atlantic Ocean opened the prelude to the invasion of alien worlds, and mankind entered the alien world era. When humans were retreating steadily, someone awakened the guardian spirit, and mankind benefited from fighting back against the alien world. Our story is that 100 years after the invasion of another world, a mercenary from another world came to this world due to an accident and became a swaddling baby, and he will also leave his own traces in this world. (In the early stage, it is mainly about love on campus, and in the middle stage, it turns to passionate fighting)