Ginyuu Mokushiroku Meine Liebe, Marginal Prince: Gekkeiju no Ouji-tachi Recommendations
Both have very beautiful male characters in a school-setting. Meine Liebe is placed in the past and its tone is a lot more serious and darker, but but both have a conspiracy going on in their plotline. So, if you've watched Marginal Prince, try watching Meine Liebe (and its sequel Meine Liebe Wieder) too.
Both series focus on the adventures and trials of a group of attractive, charismatic, elite male students destined for greatness during their time at their prestigious academies.
Meine Liebe has the same general premise (anime converted from a dating sim after removing the player's character) but did a much better job of producing a solid storyline, interesting characters, and higher quality production. That being said, Marginal Prince is worth a watch due to how hilariously terrible it is.