Is it a dream or reality?! When you sign up for a service that uses AI analysis to send out a "little sister" that matches your desires, it turns out to be the waitress you saw at the cafe!? She completely agrees with the protagonist's actions and seduces him with a blowjob even though she's in the middle of work! The protagonist can't get the waitress out of his head, so he calls her to a hotel on his way home from a drinking party and has sex with her, revealing his desires! He wakes up in the morning and says, "I'll always be by your side, big brother!" and has sex with her in complete agreement!