Fuguuna Futari no Aishikata

Natsuko Takamiya (33) is in despair after being dumped by the man she was planning to marry. She commutes between the apartment she bought and her workplace, and her only joy is a nightly drink. But her dreary daily life is turned upside down by a surly, handsome clerk who recently joined her favorite convenience store...!?

(Source: Shueisha, translated)