Seishun CYBER, formerly known as Lunalia, is a Japanese 2.8D idol boy group formed to embody the aesthetic of characters brought to life from animation. They made their initial live debut on April 15, 2021, at Shibuya Club Asia under the Lunalia name. Their early singles included “Again with you” in July 2021, “Last love song” in May 2022, and “Abracadabra” in August 2022, laying the foundation for their energetic and theatrical style. The group continued to build its catalog with “Yume Koi Candy” and “#Oshi Sengen!” in April 2023, strengthening their presence in the idol scene with catchy melodies and vibrant performances. In December 2022, new members Kabureira Yuki and Yago Atsumi joined, bringing fresh energy to the lineup, followed by the addition of Yamanaka Issay, Udagawa Hiro, and Ichimiya Haru in March 2024. On April 18, 2024, the group officially rebranded as Seishun CYBER, marking a new era in their evolution. Under this identity, they have embraced larger stages, more ambitious performances, and a stronger connection with fans. Their momentum carried into 2025 with the release of "Tanoshiku Nakereba Livejya Naijyan", a track that encapsulates their philosophy of joy-driven performance and interactive entertainment.