Ema Masono, a hard-working office worker, has a secret no one knows—that is, she's a bondage fetish de M! Her troublesome habits can't be told to her past boyfriends, and Ema comforts herself with self-bondage every day. At that time, Ema's proclivities are inadvertently found out by her colleague Rei Sado! Rei reveals Ema's hidden desires and even that ok. "Please be aware that you are owned by me." Ema is violently poked by Guchuguchu, and with bondage sex without waiting for immediate orgasm, both heart and body are satisfied. At home, in the office, outdoors... Rei's love will continue to escalate!?