what is his debutant work?
"Kaze to Kimi o Daite"
Mami Kawada
Kawada made her musical debut in 2001 after being discovered by her music teacher Eiko Shimamiya with the release of the song "Kaze to Kimi o Daite". 
who is mami kawada? A musician
wiki:16065080
Mami Kawada [SEP] Introduction
Born and raised in Sapporo, Japan, Kawada made her musical debut in 2001 after being discovered by her music teacher Eiko Shimamiya with the release of the song "Kaze to Kimi o Daite". She released her first single, a split-single with musician Kotoko, in 2002, and her first solo single was released in 2005. Her first album, "Seed", was released in 2006. She first performed overseas in Taiwan in 2007 and later appeared at the Bangkok Comic Con in Thailand in 2014. Kawada's songs have been featured as theme music for various anime shows such as the "Shakugan no Shana" and "A Certain Magical Index" series.