BOYSTYLE was a Japanese pop group, made up of members Yukina Kawada (川田由紀奈), Asami Tano (田野あさ美), Eri Murakawa (村川絵梨) and Kayoko Uehara (上原香代子).
Originally formed as ai☆ai in 2001, the group later changed their name to BOYSTYLE. They Released their first single Boys be Stylish! in 2002.
They're well known for the song Kokoro No Chizu (ココロのちず), which was featured in the anime One Piece from 2004 to 2006.