Ms. Ujuin is one of the residents of Kasukabe. Her house is the most luxurious in the whole city, and she is arrogant, smug and proud, and she makes up a lot. She has a son called Mashumaro and a servant called Tane Higashimatsuyama which she is usually scolding. His first appearance was in episode 133-1.
She reappeared many episodes later, in 571-2, when went with her son to the free classes of an English academy where Robert worked and met Shinnosuke there.