What is the name of this girl group?

I don't know if they are jpop or kpop but there are 7 girls in the group. I remember watching one video and it had them as 7 days of the week and it had a boy and they were making him look hot. That's all I remember. I think there was a girl names Mei in it but not quiet sure. and maybe a Jeni. (don't remember the names that well)