Kaya -- a promising young singer whose talent is already drawing attention with several anime collaborations in the works -- performs the opening theme for the October 2025 TV anime adaptation of "Hero Without a Class," based on the hit Earth Star Novel series. Her first-ever anime theme song, "Reincarnation," showcases her breathtaking vocal power and marks a major milestone in her career. The release also includes two brand-new original songs eagerly awaited by fans.