Koi no Tsubomi is Japanese singer - songwriter Kumi Koda 's thirtieth single under the Avex sub-label Rhythm Zone .
Koi no Tsubomi first to kick off her Black Cherry era .
Koi no Tsubomi is Japanese singer - songwriter Kumi Koda 's thirtieth single under the Avex sub-label Rhythm Zone and first to kick off her Black Cherry era .