Sister Sword Fairy, Welcome to Blue Star

Thirty years ago, the multiverse crisis broke out. Countless multiverses collided with each other, and countless "gaps" leading to different worlds appeared on Blue Star. In order to prevent being trampled to death by a highly intelligent dinosaur that traveled through time on the way to work one day, being sacrificed by an evil god while eating hot pot, and a certain demon king gaining superpowers ruling the world on a whim—— The Blue Star Federation established the International Affairs Coordination Agency. Li Huaichuan is an ordinary field officer of the Border Affairs Department. His daily routine is simple: Catch illegal travelers, repatriate alien creatures, seal dangerous gaps, and occasionally rescue them. During a certain mission, he picked up a sword immortal from the world of immortality. However... By some strange combination of circumstances, he closed the door for others to go home! Looking at the swordsman sitting on his sofa with his arms folded and staring at him coldly, Li Huaichuan was silent for a long time: "How about... You stay at my house first?" From there, things got progressively more outrageous. In order to help Jianxian obtain the "green card" to stay in Blue Star, he had to help Jianxian adapt to modern life while working with Jianxian to deal with the rift affairs. In mission after mission, Li Huaichuan gradually understood that the Bureau of Border Affairs should never be responsible only for the gaps connecting different worlds, but for the living people who crossed over from the other side of the gaps. "So-" "Everyone, welcome to Blue Star."