@Aahzy lol. You were dead see on the whole "Nagi is el hermano" thing. Don't think I can take you seriously whining about character development when you're calling a main character who's gotten roughly the same amount of screen time as Sachi a side character.Because she is side girl?
None of the characters have gotten serious development. We have a grasp of everyone's background, but no one's changed. Sachi still a brocon. Hiro still Hiro. Erika is still griping about independence yet completely reliant on nagi to do everything for her.
At least with Hiro, she's been steadfastly Nagi's love interest from chapter one, and this isn't the first time they've been teased by Miki as a married couple