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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, rules, rules”) and its confrontational tone toward authority‑enforced norms. Musically, RuLe combines industrial‑style electronic textures, distorted percussion, and hard‑driving rhythms with Ado’s agile, often screamed vocal delivery, positioning it among her more aggressive, punk‑leaning tracks such as Usseewa and Odo. A minor trivia point is that the track’s opening segment differs slightly between the single version and the album version, a detail that fans have noted in online discussions. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.