Itsuka Dareka to Asagaeri (1990)

Itsuka Dareka to Asagaeri 1990 / いつか誰かと朝帰りッ 1990 / Going Home with Someone Someday , Always in Love with Someone , いつかだれかとあさがえりッ

When her parents travel abroad, teenager Ritsuko is forced to stay alone at her aunt's apartment, until her quiet is disrupted by the arrival of her cousin Hideka who returns unexpectedly from studying in America, bringing her handsome boyfriend Keisuke with her. A clash of two titans of yesteryear, as pop idols Miyazawa and Nishida duke it out for control of the screen. (Source: DramaWiki)