Since losing her beloved husband to illness a few years ago, Chiharu has been living in a one-bedroom apartment with her daughter, Nozomi. Chiharu has never forgotten her gratitude to her daughter, who she credits with filling the hole in her Kokoro after losing her husband, thanks to her always smiling face. One day, Chiharu finds out that Nozomi is dating Nozomi, a student retaking entrance exams who lives next door. Chiharu can't help but feel happy that her daughter has reached that age. However, an incident occurs that changes the relationship between mother and daughter...