Italia-jin no Onnanoko ga Isourou suru Koto ni Natta

An Italian girl, Francesca, suddenly appears in front of Yuuji, an illustrator. At the behest of her mother, she suddenly starts to live with him! They eat dinner together and are excited to see each other in their loungewear... It's a very simple way to get to know each other better...

(Source: Kadokawa, translated)