Self-produced comedy idol duo Nama Hamu to Yaki Udon. Also known as Higashi(East) and Nishi(West).
Quote from TIF English section on them
Namahamu & Yakiudon A JK girls’ unit named from their favorite foods. JK is a short for “Joushiki wo Kutsugaesu” which means “we explode the established theory.” They produce themselves in planning, lyrics, songs, costumes and so on. They usually have a short skit during their concert, it has a good reputation.
Nama hamu birthday: 1997.8.22
Yaki Udon birthday: 1998.3.1
As you might have guessed the group name comes from their favourite food "Raw ham" and "baked udon" (although I thought it was fried udon? maybe someone can help me here...) Their fans are suitable called "gluttons."
They just last month played their 3rd one-man-live! In front of 3,000 people in TDC. They also now regularly appear on various "niche" idol TV shows so I imagine even fans of other groups have started to notice them more and more. They managed to catch Oomori Seiko's attention and she wrote a song with them!
They even recently (won a competition to?) appeared in the Tiger mask anime!
So here are some videos
FIRST the only subbed video I've found so far of a performance of theirs
Then in the tiger mask anime
Then with Oomori Seiko!
They also have their own kawaiinTV show "THE*Nama"
https://www.youtube.com/watch?v=LjUHOvOd5ZE