Watashi, Teiji de Kaerimasu

Yui is an office worker and single. She works nine to five and leaves the office on time. Her ex and father, however, are workaholics who burn the midnight oil at the office. Moreover, she completes her work efficiently so there is no need to stay back or even take work home. She likes to either go home or have a beer after work on her own time. Enter a new department head.