Susumu Yamada is Japanese, but had never lived in Japan due to his father being transferred overseas. With his father stayed for a long time in his Los Angeles branch, the family stayed in America, but Sukumu failed his promotion test and has to repeat. Frustrated, he goes on a gap-year to Japan. He embarks for the fashionable Western-style apartment "Rosemary Hotel." Once in Japan, with no money, he stumbles upon a shabby apartment by the name "Rosemary Hotel."

(Source: Wikipedia)

Included one-shots:

Volume 4: Yamada-ke no Haha, Jiman no Koibito