Yeojin and Girim were best friends in high school, dreaming of becoming successful writers. However, cracks in their friendship began to appear with the arrival of Baek Jonghak. Years later, Girim run into Yeojin and Jonghak, the two people she did not want to see again.
During a hot summer holiday Kazuki has fallen into a love relationship, albeit unacceptable to the outsiders, with one of his students, Kashiwagi Mayu. Later, he realizes that his attraction to her comes from nothing other than her loneliness and a crime labelled as grossly unforgivable.