(idol fandom) to engage in activity in support of one's favorite idol

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

何事: what sort of matter; unspecified matter

鬼事: tag (game)

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

unrealistic fantasy

secret

lesson

year-round

lip service; promising but empty talk / skillful completion of a task