At the age of twenty-seven, Sayo is completely dedicated to her job. She's the type of person who wouldn't hesitate to answer a business call while being intimate with her partner. But when her company hires Ryoichi, a charming Casanova, Sayo tries her best to resist his flirtatious advances. However, their physical attraction quickly grows into an exclusive sexual relationship that they both agree to keep detached from love until they find their true match. Will Sayo let Ryoichi into her heart, aside from just her bed?