Cohabitation System: From the Start, I Find a Cute Noble Girl

System-focused + romantic everyday life + battles + transmigration across myriad worlds + high-martial-arts world + possibly multiple female leads?

Three years after Gu Qing transmigrated, he suddenly discovered that this world was full of all kinds of "urban-story protagonists": Dragon Kings, miracle doctors, special forces kings, and stock market gods appeared one after another. Just when he thought that was all there was to it, a silver-haired, violet-eyed noble girl appeared out of thin air on his bed.

"I am Alia von Crawford. May I ask whose territory this is?"

With the arrival of this adorable girl from another world, Gu Qing activated the "Strongest Cohabitation System": every time he lived with a special person, he would receive daily rewards related to their power system. But he soon discovered that Alia was not as simple as she seemed. Though she claimed she was "not even a magic apprentice," her body held a terrifying magical power capable of tearing space apart.

As the various "protagonists" in the city began to take notice of this unusual pair, as the seal on Alia gradually weakened, and as more transmigrators from other worlds appeared one after another, Gu Qing had to use his System's powers to protect the otherworldly girl who was slowly making her way into his heart in this extraordinary world of rising heroes.

"No matter what is sealed inside you, no matter how many people want to hurt you..." Gu Qing tucked the blanket around the sleeping Alia. "I'll make this world a place that can protect you."