Shachiku To Shoujo No 1800-Nichi

Shachiku To Shoujo No 1800-Nichi summary:

The corporate slave lives with a teenage girl ...! Single old man x teenage girls junior high school student, under one roof!  Masahiko Azumane is a man who works all night even on holidays and almost never catches a break from working,  it is normal for him to return home in the morning.  One day, a girl named Yuri, came to visit him, saying that she was the daughter of a former high school classmate.  The two started living together under the promise of "until her mother comes to pick her back up”