- A maid of the Arima household who sometimes councils Teppei. She had been in an orphanage from a very young age until Isshin Arima took her in his care and brought her up to be an admirable maid. She has sworn to serve the Arima family to show her gratitude. She feels privileged to be assigned as the maid-in-charge to serve Teppei, the next heir to the Arima Group. Yuu is also an expert at computers, able to type and work at almost superhuman speed. She thinks of Isshin Arima as a parent and does have tender feelings for Teppei, but feels that she is too low in class to be with him. Of all the girls, she is the most tender and nurturing. Teppei compares Yuu to his mother. At the end Teppei has a vision where his parents welcome him home to a pregnant Yuu.
Yu has short, dark hair and sports a slim, curvaceous body with ample breasts. She is usually seen wearing her maid outfit or her school uniform.
Height: 160cm (5'3)
B.W.H: B84 W58 H83