HAHAHAHA. Koharu is recording the OP and ED for the anime. She's been in MoMusu for less then a year and she's already got a solo single planned.
Yossi was there because she is also one of the seiyuus.
"Like this kid? See, she's in MM with me, Yossi. I'm sure ya'll know who I am. Anywayz. Buy our stuff. Thanks."
Lolz...I've only seen the 1st episode, but I loved it immediately...wish there were fansubs though, and I can't seem to find a torrent link for episode 2...