I've just watched episode 2, a quite interesting one.
Spoiler for Episode 2:
I've come to hate Midori and the short-haired girl friend of Ran, how can you become so upset and emo just because your FRIEND scored a LITTLE higher than you in a stupid test, I can't understand it.
On the other hand Rui seems quite an interesting boy:
Why can't Ran hear his thoughts? Is he handicapped because he doesn't have a transmitter? Lol I guess not
I think the teacher too will have an important role in the story and might be the masked guy, but I'd rather not speculate on this.
And, yes, Ran's family is quite the lively one