Mikado Ryouko is the school doctor at Sainan High. She also helps out other extraterrestrials on Earth in various manners, usually those dealing with medical care, though she does offer students like RiMikado Ryouko is the school doctor at Sainan High. She also helps out other extraterrestrials on Earth in various manners, usually those dealing with medical care, though she does offer students like Rito and his friends a variety of her own concoctions and some help concerning matters from space.