How NOT to Summon a Demon Lord - Season 2 (2021)

The group arrives at Diablo's dungeon and have to go through several rooms filled with mazes, monsters and lava.

Diablo saves an unconscious Horn and sacrifices his shirt and cape to make a fire. Rem, Shera, and Lumachina get through several floors of the dungeon only to run into Gewalt, who attacks them. They are interrupted by a massive black dragon who attacks them all.

Zircon Tower City's defenders are no match for Varakness' army. Varakness attempts to force Fanis to marry him. Diablo takes offense to Varakness saying he is working for a Demon Lord, so his group, including Rose, teleport to the battle. Diablo, Shera, Rem, and Rose then battle the army while Lumachina heals the injured with Horn assisting her.

Lumachina decides to go to the Royal Capital to root out the corruption of the Church, but first the group returns to Faltra City. While Lumachina visits the city's church, Diablo and Rose learn that Edelgard works at a bakery with Klem and Celestine as the usual customers. Klem warns Diablo that she senses something powerful in the Royal Capital. A criminal organization led by the Measmos family has been pressuring the bakery owner to pay protection money. When some Measmos enforcers come and ruin Klem's meal of biscuits, she beats them up and leads Edelgard, Diablo,...

The group arrives at the Royal Capital, Sevenwall, and are accosted by guards, but Alicia arrives and dismisses the guards, then lets them into an inn she owns. As they eat, Horn says she wants to be stronger. Rose presents a slave collar and says if Horn wears it and makes a Master-Servant contract with Diablo, his power will flow into her, but Rem and Shera warn that if Diablo dies, she will die, plus other demerits of wearing a collar. After explaining to Alicia what is going on, she agrees to investigate the Head Cardinal, Vishos, but warns that the Law cannot ...

Lumachina is separated from the others and sentenced to execution. Diablo orders the others not to escape because Lumachina asked them not to. Horn inadvertently activates the Holy Grail she took from Diablo's dungeon and a tiny fairy-like girl named Babylon appears. She explains she appears to those who offer blood to the Grail. Babylon offers to make Horn stronger, but her spell doesn't work. With little options left, Horn puts on the collar.

Vishos merges with Europa and boasts that he is a God, then starts smashing the church while trying to kill Lumachina. Diablo learns he is protected by a force field, so he asks Lumachina to cast Dispel to destroy the force field, but must protect her as it takes a long time to cast.