The Consortium for the Promotion of Broadcast Script Archives in Japan (Representative Director: Shunsaku Ikehata) conducts collection and preservation activities to prevent the dissipation of broadcast program scripts. Screenplays of broadcast programs such as dramas are released to some public institutions (National Diet Library, etc.)..
You can search for the screenplay viewing location of the broadcast program in the "Screenplay Database".
Screenplay database
http://db.nkac.or.jp/
This activity is supported by the Agency for Cultural Affairs' subsidized project "Research and Development on Archives for Cultural Materials-Research and Research on Archives for Broadcast Program Scripts and Scripts-" (since 2012). It is released as part of research activities.