Katayoku Doumei

Sawako, a 22 years old female pilot working for a local air freight service provider, WING. One year ago, she married her then-trainer, Tametomo, who was 37 years her senior. The marriage lasted only 3 days, after Tametomo was killed in his plane crash. It took Sawako a long time to recover from Tametomo’s death, not without his step-son’s constant side-by-side support. One year later and lives moved on – Sawako is now living with Tametomo’s step-son, Daitarou, who would still call her ‘ma’ from time to time… But the thing is, he is actually 7 years older than Sawako, and he has already fallen in love with her a long time ago….

(from mangaupdates)