I've re-read all three volumes because of the catchup, and it's a ride right from the opening, with the first shot being Nanami's notes on "How to start a conversation with a new friend", and first shot of Kaoru being him rehearsing his apology for being a boy IRL. These two are so silly, wholesome and lovable...
I've forgotten so much of it already, and there are tons of funny and touching moments. Even some of the footnotes are hilarious! (Personal favourite: "Lag is a catch-all excuse for gamers. It usually doesn't mean anything.")
And I love how much the manga can often do with very little. Like, there's a chapter (four pages, they're often short) about the pair of them letting some older people sit on a train, and it's sweet and funny and a little embarrassing and very relatable, and all that in such a small place, about such a small thing...
There's also some really great side characters, recurring or not; like the two ladies at the clothing shop where Kaoru usually buys girl clothes, or the clubmates who are around Ryuuji and his senpai. They bring a lot of colour and humour to the story.
Even after rereading, my favourite exchange remains:
"You should never open a girl's closet without permission! Didn't you learn this in school?!"
"Does a girl's closet always shoot out an avalanche?"
"Yes! Remember this!"