Dark forces to no tatakai ga keshi ni chikazuku to, Dark Lords no naka de Undead King Leonis Death Magnus dake ga nokoru. Kachi o tooru tame ni yori tsuyoku naru hitsuyou ga aru to mitoshita Leonis wa, jibun o chika ni fūin shi, sen-nen go ni saisei shite jama no gunzō o fukko suru yotei de aru.
Shikashi, sono kaku ni sekai wa kesshite henka shita. Leonis no taii o motarashita sensō wa wasureare, arata na kiki: Voids to yobaru kyōjin-tachi ga arawareta. Mahō wa jōdō gijutsu ni yotte kawari, tokushu nōryoku o motsu mono wa, Holy Swords to yobaru buki o tsukai, kono Voids ni taikō suru tame ni Excalibur Academy de kenshū o ukeru.
Jū-nen no kodomo no hito no kao de saisei shita Leonis wa, jibun no fūin no ato o mitsuketa Riselia Ray Crystalia to deau. Riselia wa Leonis ga kioku o ushinatta to kangaeri, kare o tasukeru koto o kesshin shi, Excalibur Academy ni nyūgaku saseru. Sekai no shihai o mezasu Leonis no yabō wa, kare ga mae ni shita sekai to wa kesshite chigau sekai o ayumi tsukeru made wa, ichi-ichi to shinaide wa naranai.
