Rintaro finally returns to the North Pole and tells the story of how Master Logos is the true traitor who is obsessed with the All-Knowing Book and its grand powers. Touma says now they know who they are truly up against.
Rintaro and Mei are on the rooftop. He recalls the last time they were here when Touma vowed to save the sad boy. Rintaro thought that was ridiculous. But Touma did indeed save him and overcame Primitive Dragon’s berserkess.
Master Logos laughs to himself as he anticipates the return of the All-Knowing Book. Meanwhile, Kento thinks of how he must not waver from his mission to seal the Seiken.
Storious is using a forbidden technique to add a page to Legeiel’s Book which he can then use to fill his insatiable anger toward Touma. Storious hands Legeiel the upgraded Book and tells him to show off the new power.
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Kento says he came back to save the world from total destruction. And to do that, he will seal away every single Seiken. Reika says she will not allow that and tries to strike at him. But Yuuri blocks her and sends her smoky self flying, along with Rintaro.
Rintaro, Ogami-san, Ren and Tetsuo are lying dead on the road while a bleeding Mei calls out to berserkTouma. He cries out from within Primitive Dragon, but can’t control his own body as he slashes at Mei.
Back at the shop, Touma tells the others that he blacked out when he used the Primitive Dragon Book. He says he met a mysterious man in the Southern Base who led him to where Storious had just retrieved the Book from. Tetsuo says that was the Forbidden Library where the most dangerous Books are kept. But only Master Logos is supposed to have access to it. Touma asks Tetsuo to analyze it.
Tetsuo explains to the others how he has been studying if all their swords could possibly separate humans from Megidos just like Touma’s Rekka. Mei brings up the people whose Books were completed already and Touma says they should be able to find a way to save them as well.
At the shop, Tetsuo explains that Rekka can split humans from Megido. But Master Logos has declared they are willing to sacrifice humans in order to save the world. Though Tetsuo suggests Reika might be feeding them fake news.
The doorbell rings and Tassel opens the door to welcome Yuuri in. Yuuri is amazed after learning how different justice is now compared to 2000 years ago. Which is why he wants to return to being a swordsman. And to do that, Tassel must return to him the Story of the Radiant Blade Saikou, which contains his entire history as a swordsman.