Junichi is the main protagonist of the series. He is a second year high school student and had a quarrel with a transfer student, Yuuhi Katagiri on the first day of school. It turns out that Yuuhi is his fianc&eacute; as arranged by his family. His life takes a drastic turn with Yuuhi entering his life.When he first met her he had the impression she was a helpless girl and kissed her because of a misunderstanding. After that, Yuuhi becomes much more violent towards Jun&#039;ichi. Since Yuuhi is often harassed, he finds himself protecting her; as time progresses, their love for each other grows, even though neither of them will admit it. Throughout the anime series it is hinted that Jun&#039;ichi has romantic feelings for his sister Minato, but he is reluctant to admit this even though he sometimes has fantasies about her.  ~!However, in the final episode, he realizes that he cannot live without Minato and confesses to her, for some sweet (or so they think) incest action!!~

On his way to school Junichi Nagase saves a girl from danger. Later due to a misunderstanding he kissed her. Shocked and disgusted, and without understanding what just happened or why, she screams at him and tells him to "just die!" As it turns out, the girl, Yuuhi Katagiri, is a new transfer student and, much to the surprise of Junichi and his younger sister Minato, their father arranged for Yuuhi to be Junichi's future wife! Of course, getting married to "that perverted idiot" is the absolute last thing Yuuhi wants! Junichi's crazy school life with his tsundere bride-apparent has begun!<br><br>
(Source: Animesuki, edited)

__Height:__ 171 cm  
__Interests:__ Film appreciation  
__Abilities:__ Mimicking chirps of small birds
__Awards:__ Best Male Rookie at 2nd Seiyuu Awards (2008)

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Everybody goes on vacation to Ayanokouji's private island for fun in the sun. Hilarity ensues.

Jun'ichi Nagase attends a prestigious high school. He has the nickname Geno Killer since he was rebellious in middle school. This is used, inadvertently, to help a girl named Yuuhi Katagiri from trouble. She later transfers to his school, and in order to protect Yuuhi from danger, Jun'ichi is forced to kiss her. Not understanding what happened, she screams at him. Subsequently, it turns out that Yuuhi is his fianc&eacute; as arranged by their parents. Their parents discuss the matter and order them to go out together for a month to restore their relationship. If their relationship does not get better, the engagement will then be canceled.