"Balalaika"(バラライカ,Bararaika?) is the second solo single of Morning Musume and Hello! Project member Koharu Kusumi, under the name of "Kirari Tsukishima starring Koharu Kusumi (Morning Musume)" (月島きらり starring 久住小春(モーニング娘。)?). Tsukishima is a character in the anime series Kirarin Revolution that Kusumi is the voice of, and "Balalaika" is also used as the second opening theme song of the series. The second track on the single is "Mizuiro Melody". The limited first press edition of the single contains a special Kirarin Revolution card.
The Single V version of "Balalaika" was released on November 8, 2006.