Ado’s RuLe is a single‑track release that came out on 5 July 2024 as her 25th digital single, arranged and produced by MARETU, and later included as track 12 on her second studio album Zanmu, released on 9 July 2024. The song serves as the theme for the Fuji TV drama Billion×School (ビリオン×スクール), echoing the show’s critique of rigid academic and social hierarchies through its repeated chant of “腐ったルールルールルール” (“rotten rules

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