It refers equally to the solutions given in this arc and the extermination of Hinamizawa at the end. No Fourth Wall: The All-solid Review Session that unlocks at the end of each dilemma arc in the seem novel. It's also closely implied that she experienced an off-display second in the seventh novel. The French edition has a very dim a person with the title of the seventh novel Minagoroshi-hen (Massacre chapter), translated as "La Solution finale".