In NightS, Masato Karashima is a skilled 'transporter' hired to smuggle various illicit items, including people, for clients like yakuza member Masaki Hozumi. As their professional relationship unfolds, an unexpected attraction blossoms, leading to a dangerous dance of desire and deceit. Kanjou Spectrum follows a high-school student attempting to assist a friend in matters of the heart, resulting in unforeseen consequences. Meanwhile, Reply delves into the perspectives of a reserved salesman and a lovestruck mechanic, exploring their emotional journey. The sequels, Reply of Reply and Three Months After Reply, further unravel the complexities of these relationships. Lastly, Night One Month After offers a glimpse into the aftermath of NightS, where Karashima revisits Masaki, setting the stage for future events.