The novel series has four main story arcs. The first story arc centers on Ayu, a 17-year-old high school student who is also a prostitute. Ayu loves no one and is loved by no one. She has forgotten how to smile and cry, and believes there is no meaning to her life. One day, a chance meeting changes her life, and Ayu slowly starts to take back her heart, and is able to find love.

[Source: Anime News Network]