From ShoujoHearts:

The protagonist, Ayumu, was secretly dating her superior at her company until he broke up with her. Though deeply hurt, she could not outwardly express it. Not long after, she began living with her well-liked co-worker, Yachi, at her grandfather's house. While living with the friendly Yachi-kun, Ayumu starts to change..

From Chibi Manga:

Naho dreamt to become an OL but while she was waiting to have the aptitude to become one of them, she started to work in a Design company. But because her manager, Sakisaka, had a bad impression about her, he just played with her. But then, he decided to help her and he even comforted her?!
This love story isn't to be dealt with by ordinary means!