Koyuki Kato , better known by her stage name Koyuki (小雪), is a Japanese model and actress. She rose to fame in the drama Kimi wa Petto with Jun Matsumoto and gained huge popularity as well with the hit film The Last Samurai.

Tramps Like Us is a Japanese manga series written and illustrated by Yayoi Ogawa. It is about Sumire, a young professional woman who takes in a younger man as a pet, and her attempts to keep her coworkers and conventionally perfect boyfriend from finding out about her pet. It also deals with the romantic attraction between Sumire and her pet.