Office worker Ryou Fujihashi is trapped inside her apartment which has set ablaze. The firefighters arrive in time to save her, and one of them happens to be Souma Mizuno, Fujihashi's childhood friend who she had a crush on. As the apartment fire gets put out, an old love gets rekindled.
Following the first season, Ryou and Souma—who revealed their feelings for each other—have finally started dating. When they thought their hearts and bodies were more deeply connected during their lovey dovey days, her ex-boyfriend Rei came to where they work. The three are reminded of their school days when their feelings grew apart. Ryou doesn't want to get involved, but he ends up teaming up with Rei.