nanshin, Imperial Japan's policy of southern expansionism towards southeast Asia and the Pacific Islands

bad effect; negative influence

engagement, a promise to marry

today, this day / nowadays

before the day is done

historic, historical / already-happened, past / former, old, traditional

oral history

historicism

historian

(Internet slang, especially anime and manga fandom) events or things from the past which one wants to whitewash/erase from history (due to it being embarrassing, poorly received, etc.); dark past