Sorry, I pressed "annoying" when I was trying to press "reply" D:
About Manato and Shuuto! I think Shuuto is a year younger, that's why he is in middle school while Manato is in highschool already... Manato said that Shuuto was born because "he was going to die"... Beside, doing sports when you're younger helps to grow and Shuuto is a soccer player since they were little D:
I'm more confused about where is the "shounen ai" in this story xD I guess even the author was confused as was mentioned in one of the last chapters xD
*English is not my first lenguage so sorry for the mistakes :x*
Maybe because Manato and Shuu's relationship is not a healthy sibling relationship(you know they lust for each other right?)
It's not really that confusing actually, most questions you have in the beginning are answered eventually, except for why Atsushi and Manato still look like they're in elementary and why there is such a big difference between Manato and Shuuto (and yes they are twins). I thought it was pretty funny, they're all nuts lol