Ano Hito wa Kinou to Onaji Sora wo Miageteru

Nobuko Kaze works for an airline company. She has a good job, good friends, and a soon-to-be-married boyfriend. Nobuko was leading a "good life," but then a major incident turned her happiness upside down...? A bittersweet love story for adults by Tadayo Miyagawa! (Source: OfficeYOU, translated)