Himuro Setsuna (Tina Tamashiro) is isolated by her classmates because of her cold appearance and has been living a solitary campus life. In fact, Setsuna has another identity - a mobile novel writer Yu Pina who is very popular among female high school students. Except for Setsuna's cousin Shimotsuki Akira (Kanta Sato), no third party knows this secret. Although Setsuna's novels are very popular, many readers criticize that there are too few love plots in them. Setsuna does not write about love plots just because she has no experience in this area. By chance, Setsuna was shocked to find that Kitami Shigure (Yuta Ozeki), an excellent student in the class, actually had an unknown dark side. As a threat, Setsuna decided to use Shigure to increase her love experience in order to write better works.