Ojousama no Kindan Yorimichi Gohan

Yuuki Saji is the daughter of one of Japan's leading zaibatsu families. Ai Hashisugi, a former delinquent who was thrown into a rich school by his parents, finds his classmate Yuuki in trouble on a street corner and decides to buy her a beef bowl. That opens her eyes to the commoners' delicacies that she's never had before.

(Source: Bunkasha, translated)