In the twelfth episode of "Dainanaoji," the story reaches its thrilling climax as Lloyd faces off against the terrifying Demon Lord Guisarme. Guisarme unveils his ultimate attack, the Mortal Dark Sphere, which gathers all mana in the vicinity and creates a devastating force capable of annihilating everything. However, Lloyd counters this assault with his own powerful spell, Void, which neutralizes the Mortal Dark Sphere and reduces it to nothingness.

Guisarme is astonished by Lloyd's ability to cast such a powerful spell and attempts to belittle him. He claims that no ordinary human should be capable of mastering the Mortal Dark Sphere, one of the highest arts of the Demon Lords. Lloyd calmly explains that he experimented with spatial magic Void long ago and discovered its abilities, leading to the mutual collapse of the two instances when they clashed. This explanation enrages Guisarme, who then tries to steal Lloyd's body, only to be thwarted by the immense force of Lloyd's mana.

Meanwhile, other characters, including Albert, Dian, and Ren, struggle with the aftermath of the battle. Albert expresses his pride in Lloyd's strength and kindness but warns him of the responsibility and consequences that come with taking members of the Assassin's Guild as followers.

As the episode progresses, Lloyd's determination to protect and help people with special abilities becomes clear. He entrusts Ren with the task of understanding her abilities and using them for good. This realization motivates Ren to work hard and prove her worth.

The episode concludes with a cheerful tea party, where the characters come together to celebrate their victories.