Shachiku To Shoujo No 1800-Nichi

Overworked office worker Masahiko Azumane begins living with Yuri, a junior high school student who arrives claiming to be the daughter of one of his former high school classmates. He agrees to take her in until her mother comes to pick her up. Masahiko is a single man whose job keeps him working through the night, even on holidays, and he often returns home in the morning. Now he and Yuri share a home while they wait for her mother, bringing together a weary adult and a lonely girl under one roof.