Nana, a female student attending a girls' school, is in love with Yoshida, a university student. Nana grew up in a fatherless household, but her father was busy with work and she lived half alone, so she started dating Yoshida, who was working part-time at the same place she worked only once. Yoshida was like a boyfriend, older brother, and father to Nana. Only a bright future awaited them. One day, Saji, a half-brother who is burdening Yoshida with her debt, appears and sets his sights on Nana. It becomes the entrance to hell for both of them...
