Animeleague

"Secret Mission: The Undercover Agents Will Never Lose" is an adaptation of "Sex Is Part Of An Undercover Agents Job"

The story follows two undercover agents Riko Ikazuchi and her junior partner Noma, who are infiltrating an apartment that is also the hideout of a criminal organization. They pretend to be newlyweds. However, when the culprits do not hear noise from them at night, they get suspicious. In order to convince the culprits that they are a married in couple in love, they start to touch and make some noise... Despite feelings of humiliation and pleasure throughout the undercover investigations, Riko endures it and devotes herself to her justice.

Reminds me of the NCIS episode "Under Covers" where Tony and Ziva have taken the place of a pair of married assassins, and they have to fake love-making in case they're under surveillance.

I've heard walls are thin in Japan.

Ah, the things one has to do