Lemon Angel Project

Both of them are about a group of girls who need to make it to the top. They also have the same amount of people and some of the characters are kinda similar. Another thing is that they're both 2006-animes which means that the drawingstyle and colors are good. I'm sure if that you liked the girls/idol/singing thing in Lovedol ~Lovely Idol~ you'll also like Lemon Angel Project! 

Both have a group of girls who are becoming famous. 

Both are about a group of girls who have to become popular.  

Both are about various types of girls doing together to become idols. 

It takes a look in how the music industry works, and has catchy songs too. 

They're both about girls who want to make their career out of singing. However, Lemon Angel Project is a little bit more serious than Kirarin, and has a stronger storyline. 

About a group of girls who want to be in a 'band/project' and it's both in the future.  

Both show girls working hard to achive their dreams.