Her older sister suddenly comes to the apartment where they live together. "Can I stay over tonight?" She comes back home but doesn't go back to her parents' house, leaving the two confused. The next day, she goes to Tokyo to look for a job, replacing her sister. "It's okay, just keep it a secret from your sister..." For the three days that she's away, I'm left alone with my beautiful older sister. I'm completely captivated by my older sister Tsukasa's passionate kisses and her naughty licking sex... The ultimate reverse NTR drama is born!