She's got that nice somewhat trolly personality.
Pout.
Wow. He caught on to her subtle hint that she wants to be called by her first name.
Wimps.
First names are a big deal in Japan.
They are, but cases like these are exaggerated from what I know. There's not this kind of romance undertone manga has. But then, they also usually make a big deal about acting more familiar to someone they like in
any way whatsoever, while the exact same action is undramatic with another friend of the opposite sex.