[wisteria233]

Originally Posted by Thess

Alto hates Brera because he's competition... there can only be one Princess Sakura and gender-view confusion character!

He also dislikes Brera (I wouldn't go far as to say he hates him) for just being an antagonistic douche to him and the rest SMS, but outside of that its really nothing personal and not to the extent of Isamu's hatred for Guld.

Spoiler for as requested by raile:

Because it was Guld's fault that Myung and Isamu could no longer see each other, so both Isamu and Myung hated him to an extent as they kinda viewed him as the cause of their problems (and he kinda was). It certainly help matters that Guld was the one who ended up acting as though it was Isamu who raped Myung, and tried to keep apart. It didn't help matters that Guld was had a high and mighty attitude while getting the way of their relationship.

Meanwhile Brera never hated Alto, he just didn't care about him, cause he felt he was better. As opposed to Guld.

But yeah there is virtually nothing in common with Alto, Brera and Ranka outside of Alto and Brera being pilots and Ranka being a singer, considering that there is no love triangle between them, and neither of them are interested in her romantically.