A runaway high school girl, Sayu, and a salaryman, Yoshida, have become accustomed to living together as time goes by. After a while, Yoshida decided and directly confronted Sayu to start thinking about her future and convinced her of the idea of returning to her hometown and old life. Yoshida's high school days ex-girlfriend, Ao Kanda, was revealed to be in the same company as him and was transferred to his branch. She is someone Yoshida had deeply cared for in the past and the unexpected presence of this person troubles Sayu's heart. Yoshida was asked "What do you think of me?" and "What I am to you?" by Sayu. An mysterious luxury car appears at Sayu's part-time job and was perplexed by what she discovered.