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The sisters are just joking its actually really cute. Later he finds them and gives them a present asking to be friends. They dont really tell u whats up with the brother. I guess they dont really talk after a fight about sempai quiting the soccor club but he and koshino kind of come to an understanding that for now and maybe forever they wont be friends after she tries to win him over but it like a nice understanding.

Okay so I read like the first three pages of volume 6 (it was a preview from amazons ebook) and thats when we meet Serina's family. Can anyone who has read all of volume 6 please spoil me and tell me if...
..her younger twin sisters really flirt with him all the time and actually fall in love with him? or is it supposed to be a gag? cause two pages in and I was already hell annoyed ヽ(`Д´)ノ
also whats the deal with Senpai's brother?