HY was founded in Okinawa by five high schoolers: Hideyuki Shinzato, Shun Naka, Shinsuke Kyoda, Izumi Nakasone, and Yuhei Miyazato. They took their unit name from their hometown "Higashi Yakena"

Hideyuki Shinzato (Vo&Gt)
Shun Naka (Dr)
Shinsuke Kyoda (Ba)
Izumi Nakasone (Key&Vo)

Former member: Yuhei Miyazato (Gt)