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Hoshimachi Suisei is Vocalist for "trapezium" Anime Film's Theme Song

https://www.animenewsnetwork.com/news/2024-02-09/hoshimachi-suisei-is-vocalist-for-trapezium-anime-film-theme-song/.207394

Hoshimachi Suisei performs MAISONdes song "Nanmonai" alongside sakuma.