JAC-216 [NTR New Chapter] Worried about his girlfriend's infidelity, he installs a handsome man to monitor her behavior...! What is the true nature of his beautiful younger girlfriend...?

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[New NTR Chapter] Worried about cheating, a handsome man is sent to monitor his girlfriend...! What is the true nature of the beautiful younger girlfriend he is so proud of...? His girlfriend is about a generation younger than him, beautiful, and has a nice personality, but she has been acting strange lately...? They used to have sex a few times a week, but it seems like it's been a while... Her boyfriend must be worried, so he sends in a handsome self-proclaimed YouTuber and skillfully moves to a cafe, pretending it's a coincidence... What? What about her promise with her boyfriend? He ends up following her to a hotel...? Not knowing that her boyfriend is monitoring her in another room, she puts on a slutty face in front of the handsome man... What is the true nature of her girlfriend that even her boyfriend doesn't know about?!