サウザンベースでは大秦寺の離脱が大きな波紋を呼んでいた。大秦寺を蔑む発言をした玲花に対して尾上が意を唱える。
一方、久しぶりに仲間が戻り喜びを噛み締める飛羽真。そして、火炎剣烈火が赤く光り、メギドと人間を分離しかけたことに希望を見出す。
そんな中、ストリウスは前回倒されたメギドのアルターブックをもう一人のターゲットに入れる。それは、前回の被害者であるマミの双子の妹・レミだった。レミを探す飛羽真と芽依の前に尾上が立ちはだかる。果たして、その真意とは？
At the Southern Base, Tetsuo's departure has caused tensions within the guild as Ryo blames Reika due to her disdain towards Tetsuo. On the other hand, Touma, whose friends have returned for the first time in a while, is starting to enjoy himself for once. Just then, his Sword of Flames begins to glow brightly, giving Touma the sense that soon he will be able to separate humans from the Megid. Meanwhile, Storious implants the new Megid's Alter Book, who was previously defeated, into someone else. This person being the twin sister of their first victim, Remi. In the midst of their search for Remi, Ryo stands before Touma and Mei. What could he possibly want from them?
