傷だらけで戻ってきた倫太郎は、何も言わずにリベラシオン（修練場）に入る。
剣の封印を解くためにアヴァロンを目指す飛羽真は、ノーザンベースの古文書から手がかりを見つけていた。同じ頃、カリバーもアヴァロンへの道を開く。アヴァロンへの行き方とは？アヴァロンで待ち受けるものとは？
一方、現実世界では、街が３箇所同時に消える事件が起きる。尾上と蓮が現場に向かうとズオスとレジエル、そしてデザストが現れる。さらにストリウスも現れ、芽依が絶体絶命の危機に。そこに現れたのは――。
Rintaro returns to the library of the Sword of Logos with several wounds on his body, but without saying a word! Meanwhile, Touma, who is desperate to find the key to unlocking the seal of his sword in Avalon, finds some clues to its location after searching through books in the Sword of Logos library! Simultaneously, Calibur is also making his way towards Avalon! Just what lies in Avalon, and who or what awaits there?! How does one even get to Avalon in the first place?! Meanwhile, in the real world, mysterious cases of three cities disappearing at once suddenly emerge! When Ogami and Ren arrive at the scene, Legeiel, Zooous, and Desast also appear! Not to mention Storious also appears, and Mei is in danger! What exactly is going on around here...?!
