Bored with having nothing to do but study, the students play a puzzle game, but it stirs up bad memories for Philomela and Rian. Alcyone ponders her assigned role. As the rainy season starts, Elias and Chise finally sit down to catch up.

With all the preparations complete, Rimuru heads out to attend Walpurgis with Shion and Ranga, while Ramiris takes Beretta and Treyni. In the meantime, Shuna, Hakuro, and Soei find both their vision and their magic detection abilities hindered by a thick fog as they draw closer to Clayman's castle. From within the fog appears the Index Finger of Clayman's Five Fingers, Adalmann, also known as the White King. Hakuro and Soei hold the enemies around them at bay while Shuna faces Adalmann one-on-one.

With all the preparations complete, Rimuru heads out to attend Walpurgis with Shion and Ranga, while Ramiris takes Beretta and Treyni. In the meantime, Shuna, Hakuro, and Soei find both their vision and their magic detection abilities hindered by a thick fog as they draw closer to Clayman's castle. From within the fog appears the Index Finger of Clayman's Five Fingers, Adalmann, also known as the White King. Hakuro and Soei hold the enemies around them at bay while Shuna faces Adalmann one-on-one.

Sanosuke is visiting the sukiyaki restaurant Akabeko, where he always leaves his bill on a tab. One of Akabeko's workers, Tae, asks him to go buy a Nishiki painting from the painting shop on her behalf. Though Sanosuke had no interest in paintings, he finds one at the store that catches his eye. It was a painting of the man he looked up to as his master back when he was a member of the Sekiho Army, Captain Sagara. With a gleam in his eyes, Sanosuke makes his way to meet with the artist of the painting.

Nanami, Maki, and Naobito are driven to the edge after the Special-Grade Cursed Spirit, Dagon, activates his Domain Expansion, Horizon of the Captivating Skandha. Fushiguro gives them a glimpse of a way to escape death, then Toji intrudes upon the fight.

Isaku is super bored after finishing her summer break homework, so Keiya suggests going to a festival together. Is it a friendly outing, or is it a date?!

The mystery deepens as all the students drained of magic suddenly wake up feeling fine. Rumors about the culprit start to rise among the student body. Veronica checks in on Philomela.

Moz and the Kingdom of Science form a tenuous, temporary alliance against Ibara. How long it will last is a question they can't afford to concern themselves with just yet.

After the death of Sweyn, King of Denmark, war breaks out in England once again having lost its ruler. Canute, who once despised conflict more than anyone, walks a bloody path alone in order to conquer England.

There is a way to save the witch, Rahvella, from her curse, but will Kisurugi truly be willing to pay the price? And when the method of Saitou’s arrival in this world is discovered, will it change things between him and the others?