Collaboration: Hearts Grow

Hearts Grow was a band from Motobu, Okinawa, Japan. Their first single Grow!! was released independently (in limited quantities) on 19 April 2006. Hearts Grow made their major label debut on 18 October 2006, with the release of their first single Road. Their second single Yura Yura was released in Japan on 6 December 2006. They are known for performing the ninth opening of Naruto, Demashita! Powerpuff Girls Z's fourth ending, the fourth opening for Gintama and the first opening of Tetsuwan Birdy: Decode.

The members are:
* Haruna (ハルナ, real name Arasaki Haruna (新崎あらさき春奈はるな)), born 27.10.1986 - Vocal
* Chiaki (チアキ, real name Miyagi Chiaki (宮城みやぎ千秋ちあき)), born 23.10.1986 - Keyboards & Vocal
* Natsumi (ナツミ, real name Nakasone Natsumi (仲宗根なかそねなつみ)), born 24.05.1986 - Guitar
* Shintarou (シンタロウ, real name Nakata Shintarou (仲田なかた慎太郎しんたろう)), born 15.02.1987 - Guitar
* Kousuke (ユウスケ, real name Shinkawa Kousuke (新川しんかわ由ゆかり高だか)), 17.02.1988 - Bass

Former members:
* Yuuya (ユウヤ, real name Yamakawa Yuuya (山川やまかわ優ゆう也)), born 26.01.1987 - drums (left January 2008)