Rika Ishikawa
On December 31, 2005, former Morning Musume members Mari Yaguchi, Kaori Iida, Natsumi Abe, Yuko Nakazawa, Ai Kago, Nozomi Tsuji, Rika Ishikawa, Maki Goto, and Kei Yasuda joined the current lineup of Morning Musume to perform the group's signature hit "Love Machine" on the 2005/2006 edition of "Kōhaku Uta Gassen". The performance was Yaguchi's first since leaving Morning Musume eight and a half months earlier.