Both of these are about a relatively normal girl who tries to confess her love to the guy she likes, but then various problems such as love triangles appear and other guys or girls get in the way of their confessions.
Both are also by Nana Haruta so are narrated in a similar way along with the same kind of storylines present in both.
The art is similar and they both have love triangles. The main girl loves a boy in Love Berish! like thee main in Rockin' Heaven. Both have similar plot and they both have lots of romance!