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Naoya Inaba (Nakajima Yuto) grew up abroad and from his childhood experience, he thought “yankees” were the strongest heroes (in Japan "yankee" refers to delinquent youths). He was influenced by Japanese yankee manga while abroad and because of his own experiences and mangas, he is always full of chivalrous spirit. Naoya arrives to spend a year in a high school in Japan. He attends a technical high school which emphasis on the location being center of "water polo supremacy" but is on the verge of closing down. Naoya admires the school because a yankee, whom he admired as a child was once a student there. However, he soon realizes that there are no real yankees like hero figures, only students who spends their days meaninglessly. Naoya is disappointed and decides to do something about it.

To deal with the increasing violent crime rate in the Shinjuku area of Tokyo, a special investigation team is formed at the Shinjuku Police Station. Detective Shunsuke Yamashita (Hideaki Ito) and Detective Keiichi Tashiro (Kenji Sakaguchi) begin work at the special investigation team. Detective Shunsuke Yamashita doesn't care about details and says what he thinks. Meanwhile, Detective Keiichi Tashiro is diligent and enthusiastic with his investigative work. The two men frequently argue, but also cooperate to solve the cases.

Kato (Watanabe Daichi), a scriptwriter, is in love with Miho (Nao)—but he can never manage to muster up enough courage to make the relationship anything more than a platonic friendship. Seemingly oblivious to Kato's feelings for her, Miho is always calling him up and spilling her guts about her own love problems. She's in love with someone else, it turns out, but Kato swallows his pride—hearing about it all is almost too much to bear, but he wants to be with Miho as much as he can. In the meantime, the script he's working on for a TV drama mirrors a lot of his relationship with Miho. One day, Kato's friends tell him that his views on love are all mistaken, that he shouldn't delude himself into thinking that his dead-end crush on Miho will go anywhere. Emboldened and motivated, Kato finally decides to tell Miho exactly how he feels.