Gendai Teni no Dai Ni Ouji

Overview

Alberto di Saloum is the second prince of the Kingdom of Saloum. While working in the castle, Alberto gets caught in a tremendous rush of magical power and finds himself transferred in a strange land with his brother, the 7th Prince Lloyd. The paved ground, the towering buildings, the unfamiliar clothing… Alberto is perplexed, but he is determined to protect his beloved brother and return to their world. First he has to find food, clothing, and shelter… Just as he was wondering how to do that, he hears, "Hey, hey, hey, what are you guys doing in this back alley?" A woman named Natsume Arisugawa calls out to them and helps them to find a place to live and even a part-time job, as Alberto begins to live in our modern world with Lloyd! (Source: Kodansha, translated)

Source: AniList