In Kamen Rider Saber Ep. 7: The Sword of the King, Lies In Avalon!, Rintaro returns to the library of the Sword of Logos with several scratches 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 word, mysterious cases of three cities disappearing at once suddenly emerge! When Ogami and Ren arrive at the scene, Legiel, Zuos, and Dezast also appear! Not to mention Storius also appears, and Mei is in danger! What exactly is going on around here?