Orenchi ga Joshi no Tamariba ni Natteiru Ken

At his homeroom teacher's recommendation, Jinpei Itsuki moves to Tokyo and enrolls in high school. He reunites with his childhood friend, Kanna, but she has become a genius entrepreneur, earning several hundred million yen a year while still a high school student! Furthermore, his class also includes the next ace of Japan's track and field world and a nationally famous actress, and he learns that he is, in fact, at a prestigious high school where geniuses gather. For some reason, these high-spec girls start showing up at Jinpei's house...?!

(Source: Kadokawa, translated)