Shachiku To Shoujo No 1800-NichiThe corporate slave and the girl’s 1800 days ; 社畜と少女の１８００日

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”