RBK-102 Undercover Investigator Haruka False Submission Jusshu Ruu

"The head of the secret organization, Oniyama... is famous for being cautious. He never keeps records of organizational charts or business partners. Everything is in his head, so we have to extract the information directly."
"Oniyama is currently hiring a secretary at his public-facing company. We'll get you hired there, then have you infiltrate the underground operations and become a direct subordinate to gather information."
"…Jump into the enemy boss's lap? That's reckless."
"But we have no other choice!""
Detective Haruka infiltrates the enemy organization. She gets close to Oniyama, secures the position of secretary and lover, and begins extracting various secret information.
After three months of infiltration... an opportunity to obtain crucial information arrives. However, that night...