"the affairs of adults", a euphemistic and intentionally vague explanation for things

犬, 狗: dog / 戌: the hour of the dog; a historical duel-hour equivalent to 7PM - 9PM

率寝: / 寝ぬ: to sleep / 去ぬ, 往ぬ: to leave

電: lightning, a lightning bolt/lightning strike / 稲妻: lightning, a lightning bolt/strike

因果: fateful, unlucky

印画: photographic print / 因果: cause and effect; karma; fate / 院画: a picture painted in a Chinese style / 陰画: negative photograph

印画紙: photopaper

(dialectal) Nonstandard form of 担う (ninau /になう/, “carry on one's shoulder, to bear”).

emphatic nominative case marker

石: stone