Quick answer — Egoist performed 1 anime theme, including "KABANERI OF THE IRON FORTRESS" from Kabaneri of the Iron Fortress.
Egoist performed the anime theme songs "KABANERI OF THE IRON FORTRESS" (Kabaneri of the Iron Fortress).
Egoist's first listed anime theme is "KABANERI OF THE IRON FORTRESS", the opening of Kabaneri of the Iron Fortress.