Just watched them on Music Japan.
It was half-lipsynced. Reina, Takahashi, and maybe Koharu were live. Well usually they do have some kind of studio help, but what stuck out was Risa's "baby baby", it was totally lipsynced or her mic wasn't on...they were probably singing overtop of the studio stuff too.
Their intro was very short, no talk. Their song was also very short, like at the end it kind of just cut off.
oh, and Takahashi's "ue"s sound really weird.