Young handsome salaryman Yoshida had finally gathered up the courage to confess his feelings for his employer and longtime crush Airi Gotou; sadly though, he ended up rejected, and goes out drinking with his co-worker/best friend Hashimoto to relieve himself of his sorrows. While heading back home in a drunken state, he meets Sayu Ogiwara, a teenage high school girl who asks to spend the night with him. The next day now sobered up, Yoshida asks Sayu how she ended up at his apartment: she reveals that she had ran away from her family and home in Hokkaido and has been surviving on her own by prostituting herself to random strangers and having one night stands with them in order to earn money to support herself. Now knowing her backstory, Yoshida feeling bad for her finds himself unable to kick her out of his house and their lives of living together as a couple begins.
