Hiyoko is a second-year master's student in the Graduate School of Science and Engineering. She tends to be overbearing when in love and her boyfriend has just dumped her without a word. As she was feeling depressed about the breakup, Naruse, a smart guy in her lab, proposes an experimental relationship, saying, "I want to analyze your love life and figure out your problem..." But whenever Naruse gets close to her, her heart rate seems to blow up off the scale! (Source: Kodansha, translated)