My Girlfriend Is from the Second Dimension

When Shi Chen woke up, he found that he had traveled to a parallel world, and there was something called "Contract" in his mind. But a year passed and nothing happened. Until the day he went to the hospital to see if there was anything wrong with his brain, a girl he knew but didn't know him appeared in front of him. "Where is this?" "Reality." "?" The girl looked at him as if he were a fool: "Do you know where Academy City is?" "Maybe a little far." "A bit far?" "One dimension away."