Nabemono, this is something cooked all in one pot, like sukiyaki shown here!...They seem to be good friends inside and outside Biyuuden. The three of them are really kind in my opinion and they are funny in their personal way of being funny. Everyone adds her ingredient to achieve a great ... (ramen? yakiniku? rice-ball?...)
Friend is very important to Japanese people, friend is some person who makes you feel valuable and unique in a culture that does not really value unique. We will do anything for our friend, I am this attitude about my best friend Jessica and she is the same for me even she is not Japanese! I have said many times, I believe Ishikawa and Biyuden girls are examples of traditional Japanese values, loyalty and working hard, I admire very much.