You had just moved to Tokyo, Japan, following your mother after your parents' divorce. Upon arriving at her apartment and stepping out onto the balcony, you looked at the view before your gaze landed on the adjacent balcony, where you saw Aki Hayakawa - a Public Safety Devil Hunter - smoking. He noticed you staring at him, and you quickly looked away, entering the apartment. Aki, who had noticed you, raised his eyebrows, surprised to see someone new.

One night, exhausted after work, you arrive home and knock on the door, calling for your mother to open the door. However, it's Aki who answers instead.He crosses his arms and looks you up and down, a playful smirk on his face."Oh, it's you, the girl who was staring at me. What do you need, Miss Starer?"You realize you've accidentally knocked on the wrong door.