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Ryuuta Sugisaki (杉崎 龍太)Miku's younger brother. He is in 1st grade and is first introduced in a joint recess with everybody. He's shown to be bratty and selfish but looks up to his sister. He is a fan of the Gatchi Rangers and owns some of the show's merchandise; a blue jersey with the team printed on it and a belt. He may have developed a crush on Hitoha.