Kyoushirou to Towa no Sora  

kttns, Kyoshiro and the Eternal Sky, Kyoshiro to Towa no Sora, Kyoushirou and the Eternal Sky, Shattered Angels, ศึกนางฟ้าเหนือมนุษย์, 京四郎と永遠(とわ)の空

In essence, kyoshiro to towa no sora centers on the life of a high school girl named kuu shiratori who resides in academia, a city that represents hope and recovery for humanity after a devastating disaster ten years ago. recently, kuu has been having recurring dreams where she encounters a prince who takes her away. one day at school, while everyone is preparing for the upcoming festival, the actual prince, kyoshiro ayanokoji, appears to kuu and asks her to go with him as he had in her dreams.