"Koi Kana"(恋☆カナ, lit. "Is This Love") is the first solo single of Morning Musume and Hello! Project member Koharu Kusumi It was released under the artist name "Kirari Tsukishima starring Koharu Kusumi (Morning Musume)" (月島きらり starring 久住小春(モーニング娘。)) on July 12, 2006. Tsukishima, voiced by Kusumi, is the main character of the anime series Kirarin Revolution of which "Koi Kana" was used as one of the show's opening theme songs. The coupling track of the single, "Sugao-flavor", was used as one of the show's ending theme songs. The limited first pressing edition of the single contains decorative stickers and features a different album cover than the regular edition version.