Hige wo Soru. Soshite Joshikousei wo Hirou.

Yoshida is just your average salaryman, drowning his tears in booze. On his way home one night, he finds a runaway high school girl sitting on the street. She offers to sleep with him in exchange for a place to stay―and Yoshida lets her off the hook and offers her work instead. A rom-com between the most unbalanced couple you'll ever find!
(Source: One Peace Books)
Note: Includes 1 extra chapter.