B.B.F.

Background
"WE ALWAYS WIN!" "B.B.F." is an original duet song featuring Hatsune Miku and Kagamine Rin. It is a partially bilingual song about Miku and Rin being superior over a boy, referred to several times.

B.B.F has over 100,000 YouTube views. It is a collaboration between Heart★breaker and KIRA. This is the first time Heart★breaker and KIRA have ever collaborated.