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Seiichi Yukimura is the captain of Rikkaidai, and is known as one of the Big Three, who has a strong willpower, stern, brutally honest attitude on court. He is called "The Child of God"(demigod) due to his strength in the tennis court. As one of the few who can activate Muga No Kyouchi, he returns the opponent's every shot, which takes away their main senses as playing subconsciously leaves them "no longer wanting to even cross the net." Despite his strength, he has a very frail and feminine appearance, and he is very friendly to others outside of the court.

Source from Wikipeida