(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

study of history

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

Synonym of 新撰万葉集 (Shinsen Man'yōshū): a 私撰和歌集 (shisen wakashū, “privately-compiled waka anthology”) in two volumes in which the poems are completely written in 万葉仮名 (man'yōgana)

液滴: drop (of liquid)

the very same person

木炭画: charcoal drawing

小夜: small nightwear

黄立羽: an Asian comma (Polygonia c-aureum)

dedication in a book