Information:
10 nin Matsuri means "10 Person Festival" in English. They were part of the annual Hello! Project Shuffle (which also consisted in this year of 3 nin Matsuri and 7 nin Matsuri), which involved taking various girls from Morning Musume and other groups, and mixing them into different groups to perform a single song. At this time Iida Kaori, Abe Natsumi, Yasuda Kei, Yoshizawa Hitomi, and Tsuji Nozomi were in Morning Musume, Mika was in Coconuts Musume, Rinne was in Country Musume, and Murata Megumi, Saito Hitomi, and Ootani Masae were in Melon Kinenbi. Bloodtypes: Iida - A, Abe - A, Yasuda - A, Yoshizawa -O, Tsuji - O, Mika - A, Rinne - B, Murata - O, Saito - A, Ootani - O.