Ore no Imouto ga Konnani Kawaii Wake ga Nai. – 03

"Don't you think Saori looks better without her glasses?" said no one ever.

(Ore no Tomodachi ga Megane o Hazusu Wake ga Nai)
"My Friend Can't Take Off Her Glasses"

One thing is now clear about almost every character in this show: you're either an imouto, you have an imouto, or you act like an imouto. It's the glue that links every character together, where even the most unlikely pairings can arise.