When Ginta liked Miki, he saw Yuu as a rival because he knew that Miki liked Yuu. Although initially Ginta couldn't stand him, they eventually became good friends. When Miki chose Yuu over Ginta, Ginta was sad at first, but later told Arimi that he was relieved that Miki had finally made her decision. Yuu is a fairly secretive guy who tends to hold in his emotions, but he gets better at allowing them out when he starts dating Miki.

Ginta and Rokutanda are rivals in everything. Since they are cousins, and the same age they get compared a lot. Yuu thought that they were both alike because they caused him so much trouble ^^;; These two fought over everything from tennis to Arimi. Rokutanda has been in love with Arimi since he was little, but when Ginta and Arimi became a couple Rokutanda told Ginta that he could have her (well, eventually... they had to duke it out fist ^^;;;). However.... during the New Years episode Rokutanda's wish that he would find a girlfriend many times prettier than Arimi. Eventually he ends up with a very nice girl called Yayoi.

Yuu, Rokutanda and Ginta often have competitions together. Usually the loser has to shave his head like a monk. Needless to say, Rokutanda doesn't usually have much hair ^^. Whenever the three of them are together, Rokutanda will usually challenge them to something stupid. ^_^ Eg Who can sell the most clothes, skiing, tennis, etc