(Now, for the first time in my life, I'm watching someone else have sex) Makino Izumi used to spend her days eavesdropping on her classmates' whispers about "having sex with their boyfriends" at school, feeling envious. One day, while searching for the keyword "sex observation" online, Izumi impulsively contacts a person advertising. Then, at the appointed meeting place, surprisingly, Jun, who looks like an ordinary college student, and his sex friend Shiho show up. Her relief was short-lived, as when they arrived at the hotel, the two began to take off their clothes as if they were used to it, and began to give Izumi a blowjob as if it were the most natural thing in the world. Without even being fully prepared, Izumi is forced to watch real sex...!?