ELFENSJóN is a distinguished Japanese doujin (self-published) music circle established in late 2018 by the accomplished composer and arranger Keisuke Kurose, known for his previous work with Asriel and Uroboros, alongside the talented manga artist and illustrator Kachiru Ishizue, celebrated for her notable creations such as Ilegenes – Kokuyō no Kiseki and Rosen Blood. The music of ELFENSJóN is an innovative fusion of symphonic metal, gothic rock, and alternative rock, often termed Animecore, reflecting the seamless integration of anime aesthetics in both sound and visuals. Their work is defined by complex arrangements and narrative depth, with a thematic focus on dark fantasy, featuring compelling characters like Elisia and Astral.