Spileben is a solo project by Wakana Okuma that began in October 2024. Based on dance music, it incorporates genres such as Hip Hop, R&B, and EDM, delivering "music as envisioned by Spileben." As for their works, they made a brilliant debut with the release of their 5-track 1st EP, "Joshou (Prologue)," in October 2024. Later, at "KENPROCK FES2024," they graced the stage with an overwhelming live performance that captivated the fans who rushed to attend. In June 2025, Spileben declared the start of Chapter 2, unveiling new visuals. In September 2025, they digitally released their 1st Digital Single, "DEADLINE," after approximately 11 months.