Sumire Iwaya (Noriko Iriyama) works as an editor for a well known newspaper. She is attractive and graduated from a prestigious university.
She goes through a difficult period after being dumped by her boyfriend and getting demoted at work. One day, she picks up a beautiful young man, Takeshi Goda (Jun Shison), out of a box. Takeshi looks like her former pet Momo and Sumire offers to let Takeshi live in her home as her pet.
Based on Yayaoi Ogawa's Japanese manga "Kimi wa Pet" serialized from 2000 to 2005. The comic won the 2003 Kodanisha Manga Award.