Welcome Back!

(Y/N) (17) is a professional kickboxer, well professional. You're coming back to Japan from America where you won the International (Kick)Box Chapionship (IBC).You've been friends with Rin, Haru, Makoto, Nagisa, Souske and Gou (your bff) as long as you can remember and recently Rei two. You always wrote them letters and Skyped with them but Rin never replied to your letters and/of texts. What if doesn't want to be friends anymore..?