Based on available records for the *Forest of Piano* franchise—spanning manga, anime series, films, and spin-offs—no concrete or direct details exist regarding the character Hirata Kousei. Official character descriptions and plot summaries center exclusively on protagonists Kai Ichinose and Shuhei Amamiya, omitting any reference to Hirata Kousei's background, narrative function, relationships, or development. Synopses, credits, and databases similarly provide no elaboration on this character's involvement in events or story arcs. Consequently, no substantiated information supports a character description for Hirata Kousei.