Kyoshiro to Towa no Sora

Shattered Angels centers on K Shiratori, a high school student who appears to be typical and enjoys her time at school in the sprawling metropolis of Academia. Ten years after the worst calamity in human history, academia is one of the indications that humanity is on the mend. In one of K's reoccurring dreams, a prince approaches her and whisks her away. The prince of her fantasies shows up one day as her schoolmates are getting ready for the forthcoming school carnival. He goes by the name Kyoshiro Ayanokoji and asks the same thing K does in his dreams: "Let's go, together."