Ryota (Masataka Kubota) and Yui (Nozomi Sasaki) have been dating for some time. They have their eyes set on marriage, but Ryota spends his days struggling with a grueling "marriage arrangement list" assigned by Yui's father, Kyogoku (Toshiaki Karasawa). At an awkward girls' party held at the Suzuki home, they talk about how Ryota and Yui first met, as well as memories of a date between Kyogoku and Kanako (Eimi Wakui). Meanwhile, Shiori (Sari Ito) of the forensics section attends a marriage activity party, where she meets an international journalist, a former naval officer, and falls in love at first sight. However, her love affair is the beginning of a new incident.