An outdoor restaurant made, owned, and operated by Chao Lingshen, the Chao Bao Zi (l超包子, Super-Bāozi) is essentially a movable stall made up of two streetcars, the second of which is a bar and kitchen with stools that fold out of the car's sides. The restaurant is only open for a limited time, usually the week before the School Festival.

As the name suggests, Chao Bao Zi specializes in Chinese cuisine, particularly the dish for which it is named, the baozi. The restaurant is usually staffed by Chao and her friends: Satomi Hakase, Satsuki Yotsuba, Ku Fei, and Chachamaru Karakuri. Chao and Satsuki cook, and the serving is done by Satomi, Chachamaru, and Ku Fei. Although it hasn't been open very long, Chao Bao Zi has become extremely popular all over the campus, by teachers and students alike at all levels.

What appear to be two gun turrets are mounted on the top of each car, but their barrels are sealed, and their purpose remains unknown. The kitchen car is also capable of flight, the stools converting into hover engines.