Нетораре: поведенческая психология одной супружеской пары (2020) Netorare: aru fūfu no kōdō-gaku

An erotic drama about a married couple struggling with sexual issues. The husband is an associate professor at a university, and his beautiful wife is Kyoko. To everyone else, they seem like the ideal couple, but both are dissatisfied with their intimate life. Then, the husband realizes that Kyoko becomes more aroused than usual when she is being watched by others.