It's the start of the arc where you meet Romeo's little sister (who apparently is his step-sister) and Romeo's big brother finally finds out that Romeo and Juliet are dating.
Though, to be fair, Hasuki is best girl. It's just that Moezuka fell in love with best girl Persia first and they have always been adorable together.
Also, good job Char! I always like that she may be against their relationship but what Persia wants is more important so she will always help Persia and Moezuka stay together as long as Moezuka stays moe.
Step-sister implies Romeo's dad or mom is a step parent which they aren't. Shuna is from a poor branch family, hired as a family servant but since she started young then she was treated as a little sister by the Inuzukas.