ReoNa's first best album, bringing together outstanding anime and game tie-in songs from her debut through 2026! The two best albums, titled "Red" and "Blue," each include one new song! The "Blue" CD includes 15 anime and game tie-in tracks plus one new song. The Blu-ray included with the First Press Limited Edition features live footage from "ReoNa ONE-MAN Concert Tour 2025 'HEART' at Showa Women's University Hitomi Memorial Hall (2025/12/22)." Also includes a photobook (different design for each edition), liner notes, and a set of three trading cards (different designs for each edition).