Ojousama no Kindan Yorimichi Gohan

Yuuki Saji is the daughter of one of Japan's leading families. Aoi Hashisugi is a former delinquent forced to go to a fancy private school by his parents. When he finds his classmate Yuuki lost and hungry on a street corner, he decides to take her to a beef bowl restaurant. There, he opens her eyes to the commoner's delicacy, which the sheltered girl is tasting for the first time. (Source: Bunkasha, translated)