Suppose the villain starts appearing on and off like the middle part of a movie

Tatoeba Eiga no Chūban no Yō ni Akuyaku ga Chirachira Suru Kuraimakkusu Ippotemae (たとえば映画の中盤のように悪役がチラチラするクライマックス一歩手前)

To ensure Alka keeps her powers, Vritra's body must be resurrected. Alka reveals that Kunlun's dungeon is actually a prison holding multiple Demon Lords, and the villagers are its guards. The prison also holds a mysterious power capable of affecting the entire world if misused, and the dungeon is in danger of being unlocked because Alka, being so absent-minded, forgot that Vritra was so important. Eug further reveals the key to the prison is the Holy Sword. Eug begins Vritra's resurrection into an egg, rendering Alka powerless until it hatches. Once alone with Alka, Eug betrays her, revealing that she waited for Alka to be powerless before beginning her plan to open the dungeon herself. 

She next sends Lloyd to search for Alka, trapping him in Kunlun while Eug teleports everyone else back to Azami and permanently closes the portal. Riho visits Rol, who starts to remember things about the magician who altered her memories, sounding suspiciously like Eug, but Riho does not notice the significance. At the match, the king is accompanied by Shōma and Sou. Suspicious, Riho asks the king to cancel the match. Meanwhile, Lloyd locates Alka and frees her.