(figuratively) driving force

(military) reserve service

a tax that temples levied on property and residents / work done at a template; also, a priest who does such work

Kyūjitai form of 戦役 (“war; battle”)

one who sets fire / (by extension) one responsible for something's popularity, etc.

auditor (one who audits bookkeeping accounts)

restricted to those under 18 years of age, due to gore, scat, or other unpleasant topics

七七日: the forty-ninth day after a person dies; the Buddhist memorial service that occurs forty-nine days after a person dies

a board game

video game software (the program of a video game)