人日: also known as nanakusa no sekku (七草の節句, ななくさのせっく: "The festival of seven herbs"); one of the five seasonal festivals, (五節句, gosekku). It is celebrated on January 7.

腎盂: renal pelvis

damage caused by rumors; specifically, reputational damage due to improper news report about an unrelated incident or resulting in economic loss

collateral damage

persecutory delusion

a difficult (to solve) case

lust murder

an allusive murder (murder arranged in a way that alludes to something else, such as an idea, a story, a fictitious scenario, etc.)

a locked-room murder (murder in a room locked from the inside)

love affair