Miu's grandfather and head master of Ryozanpaku. He never lost a figt in his life. Never. And if you think you are worthy of becoming his granddaughter boyfriend or husband you must defeat him first.
Hayato Furinji is the grand father of Miu and the head of Ryozanpaku dojo. He is very strong and never lost a figt in his life as a martial artist, out of all the masters of Ryozanpaku his training is the most hellish one of all thought he is the only one who say the he is sorry for what he make Kenichi Shirahama go throught. The Elder loves Miu greatly and alway tell Kenichi that if he want to marry her or go out with her in a date he must defeat him first, once the elder caought Kenichi being kissed by Miu on his check he become very angry to the point his Ki was released with killing intent and was so strong that it dameged the dojo and it took all the other masters to hold him back otherwise he would have killed Kenichi.