On one of these vacations, he saw Limp Bizkit and Korn music videos on MTV as a 13-year-old, later calling them "very cool" and the reason for his realisation of his profession.

This stemmed from Hayakawa feeling more natural singing in English than Japanese due to his early years learning English and traveling between Japan and the United States, and the band's western influences which helped to elevate this sound into their music and translate the energy to Japanese audiences at the time.

They handed out demos on the streets to help spread their music through word of mouth and played gigs in high school gyms and clubs.

[15] Coldrain gained traction after a couple of their songs, "8AM" and "We’re Not Alone", were used as opening themes for two anime: Hajime No Ippo: Challenger and Rainbow: Nisha Rokubō no Shichinin.

The latter was released worldwide in 2014 as a reissue, including new songs from their Japanese exclusive EP Until The End, following being signed to the North American-based label Hopeless Records that is home to bands such as All Time Low, Avenged Sevenfold and Silverstein.

[18] This allowed them to tour all around the world with bands such as Bullet for My Valentine and Papa Roach, as well as playing festivals in Europe such as Download and Rock am Ring.

To coincide with this milestone, they released their fifth studio album Fateless, in October of the same year, as well as a tour that ended with them playing at the famous Nippon Budokan venue.

His second tattoo was the symbol from the cover of the band's Nothing Lasts Forever EP, which represents not taking one's life for granted and living it to the fullest.

Due to these early years as a child, Hayakawa's earliest western and eastern influences consisted of Michael Jackson, Mariah Carey, Hikaru Utada and L'Arc-en-Ciel.

[7][8] In the nu metal craze in 1999, Hayakawa got into heavier bands, citing this as a critical point of his life which would end up helping him carve his career path.

Limp Bizkit and Korn were the first bands he saw on MTV as a teenager, with songs like "Nookie" and "Freak on a Leash" on constant rotation.

[36] His major influences as a vocalist are Chester Bennington of Linkin Park and Brandon Boyd of Incubus, who were also his two favourite bands growing up.