Starmyu, Magic-Kyun! Renaissance Recommendations
The similarities are obvious once you begin watching them; musical, reverse harem, group bonding, and school life are a few similarities that stand out the most. The biggest difference in Starmyu is the absence of a female main character, Starmyu's cast is entirely made up of guys. Other than that their really isn't that big of a difference except the lack of romance replaced in Starmyu by a little bromance but with an all male cast what do you expect.