Welcome Back, First Love.

Yamane Shiori has been living a peaceful life as an office worker when, one day, she receives an invitation to her high school reunion. On the day of the reunion, Yamane attends but finds herself unable to fit in with the atmosphere and is about to leave when a man suddenly approaches her. The man is Taguchi Ryosuke, who had been a delinquent and her fellow "loner" back in high school. At the time, with his blond hair and piercings, he had carried an aloof air that kept others at a distance. Now, however, he has transformed into a sophisticated, composed adult. Yamane is bewildered by how much Taguchi has changed. Taguchi, meanwhile, has come to the reunion with a certain thought in his heart. There seems to be a reason why he has changed so completely....