(slang, pun) Used as a replacement for the term 生活(せいかつ) (seikatsu, “life”) in sexual contexts.

"correct kana": Synonym of 歴史的仮名遣い (rekishiteki kanazukai, “historical kana usage”)

(historical) conquest of barbarians

recuperate; convalescence

to recuperate; to convalesce

world; society

clear-headed / calm

(literally) a beautiful single red flower that blooms within a field of trees and grass / (figuratively) something unique that stands out among many other things

(literary, attributive) a state of pure naturality, free from artifice

You should treasure every encounter, for it will never recur.