Coldrain are a Japanese rock band from Nagoya, Japan, who were formed in 2007. The band combines melodic singing with screams typical of the post-hardcore genre. Although the band is Japanese, all of their songs are written in English. The lineup consists of lead vocalist Masato Hayakawa, guitarists Ryo Yokochi (Y.K.C.) and Kazuya Sugiyama (Sugi), bassist Ryo Shimizu (RxYxO) and drummer Katsuma Minatani. Hayakawa has a Japanese father and an American mother and speaks both Japanese and English fluently.

Masato David Hayakawa , known professionally as Masato, is a Japanese singer, musician, songwriter, producer and model. He is known for being the bandleader and vocalist of the Japanese rock band Coldrain since their formation in 2007. He was a former member of AVER, alongside one of his fellow Coldrain members, drummer Katsuma Minatani.