Ruka Suirenji is a dance idol and a doujinshi creator. She is a friend of Chiharu and is one of the few girls who kissed Hayate, although Ruka mistook him for a female when it happened. Ruka is talented at drawing, having drawn the doujinshi Nagi and Chiharu were selling at the doujinshi convention under the pen name, Fly Dolphin. She is also a popular idol, being able to sing and dance at the same time, and has many fans.
According to Chiharu, Ruka has a similar past to Hayate, having been abandoned with a large amount of debt, namely, 150,281,000 yen. She aspires to be a professional mangaka. Ruka has a determined and hardworking personality, shown when she insisted on returning for work despite her injuries, and when she told Chiharu that she would take care of her own bad luck.
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