Junichi Nagase (長瀬 準一 Nagase Junichi) is the main protagonist of the series. He is a high school sophomore who had a reputation as a delinquent in middle school until Minato Nagase (Junichi's sister) thought of moving in with him. He has a sarcastic demeanor and is often teased by everyone around him, including his teacher. His life takes a drastic turn when Yuuhi Katagiri enters his life. They met for the first time when he saves her from some punks who were bothering her. The next day, she is introduced as a transfer student to his class. Due to a misunderstanding, he kisses her in front of the class, causing her opinion of Junichi to crack. This is further exacerbated when it turns out that their families have arranged their marriage. Despite this difficult start, Junichi finds himself helping Yuuhi whenever she is in need and as time passes, their feelings for each other start to grow even though neither of them will admit it. Throughout the anime series, it is hinted that Junichi has romantic feelings for his sister, Minato, but refuses to admit this even though he sometimes has fantasies about her. In the final episode, he realizes that he can't live without Minato and confesses it to her. However, in the manga, he and Yuuhi end up together, as he also has feelings for her.