45-year-old Kamon Xun (played by Amami Yuki) works in a library. She has long flowing hair, is beautiful and reserved, and is well-read. She is an "ideal woman" in the eyes of many men. However, Xun seems to disdain such evaluations. She holds a kind and perfect smile in her daily life, but her heart is poisonous, and she willfully criticizes all kinds of injustices and perverse phenomena around her. She has always been single and has no intention of falling in love. She thinks that the days with books are the most ideal life. On this day, Xun accidentally reunited with her college lover Yangcun Chaozhi (played by Sawamura Kazuki). Chaozhi left without saying goodbye that year, which hurt Xun's heart. Now I ask, I know that Chaozhi is the group that prefers men. Chaozhi, who is currently serving as the acting principal of a kindergarten, tells the fact that his mother (played by Fuji Junko) will soon die. He begs Xun to marry him in a fake marriage to comfort the old man. Xun will naturally not agree to such an unreasonable request, but a series of accidents will pinch them together...