Double Life

Philosophy graduate student Tamaki decides she wants to try "philosophical surveillance" as proposed by Sophie Calle and begins trailing a man in her neighborhood. Tamaki soon witnesses the man having an affair and becomes obsessed with the act of surveillance.
(Source: JFDB)
~~ Adapted from the novel “Nijyuu Seikatsu” (二重生活) by Koike Mariko (小池 真理子).