Secret Mission: Sennyuu Sousakan wa Zettai ni Makenai!

Undercover agents never lose!

Ikazuchi and Noma work for the government as undercover agents. In another mission, Ikazuchi and his younger colleague Noma infiltrate an apartment building and move in next door to the people they're tracking. They pretend to be newlyweds, but things don't go smoothly. One evening, listening to the neighbors' conversations, Ikazuchi realizes that the criminals are beginning to suspect something, because at night there are no sounds of "happy married life" from their apartment. She tells this to her coworker, and then he, starts caressing Ikazuchi's body to convince everyone that they are actually a couple in love...

- "Sampai, it's part of our job! Please moan...!"

Just like that, a lot of sexual adventures take place during the various secret investigations...