shelf life

mourning / to abhor / abhorrent, detestable / death anniversary

nickname

conspire / cheat / impose on / plan / devise / scheme / have in mind / deceive

謀: plan, scheme, plot (especially malicious one)

何事: what sort of matter; unspecified matter

lesson

鬼事: tag (game)

東琴: (music) a six-stringed koto or zither used to perform kagura music, more common in ancient times

(onomatopoeia) with the sound of something mechanical moving