Haku, who made their major debut in September 2025 and was selected for Spotify RADAR: Early Noise 2026 in 2026, expanding their stage at home and abroad, releases their major 1st full album! In addition to their major 1st single "Sore Shika Ienai," "Muchuneko," which was used as the theme song for the web animation "Ugoku! Neko Mukashibanashi!," and their latest single "Isshin," which also serves as the opening theme for the TV anime "Victoria of Many Faces," the work adds five new songs.