Teppei Arima is a second-year high school student who lost both of his parents in a traffic accident on their way home from a family trip. His grandfather, Isshin Arima, happens to wield the puppet strings in Japan's vast economy and demands that Teppei becomes his successor as the head of the Arima Group. To prepare for his debut into high society, Teppei enrolls in an elite academy for the scions of the rich and powerful. There are quite a few Princess Lover releases. They're all based on a visual novel by Ricotta. Ricotta is the author of at least a couple of the manga. The first one pictured is a one-shot tankoubon simply named "Princess Lover" with art by Yuigi Naoha. The second picture is the light novels -- Utsusemi is the author and Kitsuhi Hyuuma is the artist of those. The third book series (bottom pic) lists Ricotta as the author and Midorigi Yuu as the artist.