In this crime thriller, Yuki Tajima is a hard-working student who earns her tuition and living expenses on her own. She lives in a dormitory with Kawada Megumi, Kudo Shiori, and Asai Sana, who are in the same situation, and they work hard every day. One day, one of them unexpectedly finds out that she is pregnant. The girls decide to take revenge on another man who refuses to take them seriously, and soon discover the truth that implicates everyone around them overnight.