Secret Mission: Sennyuu Sousakan wa Zettai ni Makenai! – Narcotics Enforcement Agent Riko Ikazuchi is undercover with her junior colleague Noma in an apartment that serves as the hideout for a criminal organization. Despite Riko and Noma posing as a newlywed couple, the criminals begin to suspect them after not hearing any marital intimacy during the night. To convince them that they are a loving couple, Noma starts touching Riko’s body… Despite the feelings of humiliation and pleasure throughout the undercover investigations, Riko endures them and devotes herself to justice.