debut work; first work
Refers to the first published or released work of an artist, writer, director, etc. Commonly used in entertainment and literary contexts.
彼のデビュー作は大きな話題を呼んだ。
His debut work caused a big sensation.
This novel is the author's first work.
Compound of デビュー (debut, from English) and 作 (work, from Chinese).