Arc 4 : Back to reality.
Chapter 1: Nagito shows a sudden personality shift. Well, the house changed too, everything of value disappeared. Yuri-chan meets the Necromancer and seriously starts to worry about the state of affairs while she was out. Nagito's servants don't approve! And Berser-tan almost came back because Yuri-jo snapped and vandalized the mental house. Oh, yeah and Yuri doesn't take shit from anyone, so she ditched bizarro-Nagito's offer to become a captive princess somewhere else, pulled a Mulan and ran away. This is the debut of Bishounen!Yuri !
Chapter 2: 1 year timeskip, and Yuri-chan can't use a bow to save her life. She arrived near a village in Occidens, with Archibald, the giant, lazy horse, got mistaken for a male by the guards, helped killing a bunch of demons, and old habits dying hard, she grabbed a random dude and threw him in front of her to get the credit instead. Then she tripped, accidentally killing a demon commander and got a lot more demons pissed at her. In the extra, random reincarnated guy shenanigans.
Chapter 3: Yuri-chan goes saber mode to limit homoerotic symbolism, gets hurt and kills everyone. Then she goes to the guard for a new sword, get admirers of about every gender and runs away. Well, she tried to, but your stereotypical shounen protagonist insisted on waving the mentor flag at her nose. In the meantime, Agito's shaking down a guard for information about Yuri and polluting rivers by way of serial barreling.
Chapter 4: Yuri-chan fight against the mentor flag again! And got an opportunity to escape it by using the excuse that the village was burnt to the ground! (Wait, that just sounds wrong...) She used a large scale spell that allowed her to fight a great number of enemies, the problem is, that pretty much broadcasted her location to everyone, from bizarro-Nagito, to Tasuku, to Barrel-sama. Too bad, as she was about to kick the ass of the biggest, meanest demon around, little brother appeared, kicked her ass and she got saved by somebody else.
Chapter 5: Yuri's out, under a mind control spell, so Berser-tan, or Lily, takes the reins. They apparently got saved by Agito, but the spell had terrible effects, letting out some personalities that should never have seen the outside of the seal. And Lily somehow got it in her head to become a princess knight, amass a heroic army, march on the demon country and kick her brother's mouth, the queendom is in crisis, Necrolily raves about the beauty of Seiryu's corpse and Lily wonders why she bothered sealing that one. Agito doesn't like Odin, bad people are punished, and Lily decides to support greenpeace. Meanwhile, the reincarnated trio want their god of war sensei back and are going to look for him...
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Chapter 6: Lily gets bullied by Rider, Agito gets them lost in the forest, weird things are scared of Lily, she's a good girl. Incompetence is bad! Imouto!Yuri shenanigans, poor Agito... A village bandit is cleared, and Barrel-sama came back. Nothing much happens when Lily's out.
Chapter 7: Barrel-kun is a surprisingly good singer, Lily's hugs are apparently electrified, she learns there are different kinds of danger, and gives us a lesson on relationships with her alter egos, which happens to become very relevant later on and alludes to a certain older sister that raised them. Lily cosplays, fights bad guys in a city, and got grounded for her troubles.
Chapter 8: Lily decided to take Imouto's advice, hilarity ensues. Poor Agito. A smarmy pedo appears, Knight-kun to the rescue! Fox woman and stupid brother make their comeback (The Lily speech is starting to affect me...), and Seiryuu's creepy factor is enhanced! And apparently, Lily could have healed Queen and Yuri all along, but refrained from doing so for some obscure reason.
Chapter 9: Lily reestablishes the pecking order, Yuri is apparently dumb and self centered and Queen is deleted and replaced, Lily knows what Queen did while Yuri was, once again, kept in the dark about the whole situation. After doing some cleaning up, Lily forced Yuri in the background. We learn Yuri is , for some reason, defective, and Lily begins a mysterious assimilation process. More bonding with Agito, the students, otherworlders, demon king and Ai all are reunited, And Yuri was right, but nobody ever listens to her anyways.
Chapter 10: Yuri regains the control of their body and is confused with the whole situation, but punching Seiryuu in the face somehow makes it better. Irina and Nagito's history is confirmed, and something is seriously wrong with Tasu-guy's girlfriends. Agito, who apparently worked for Mana used Yuri as a bait to call back everyone to perform a reverse summoning ritual and apparently, Queensen ( Queen+Reisen) planned that far ahead, for Ai activated a dimensional portal home. Problem is, the demon king also opened one, so the three gates interfered with eachother and while they were sent back at the exact moment of their summoning, there were consequences. Like Yuri's ability to laser beam the alien to kingdom come...
After arc 3, that one was a bit more relaxing to write, but no less important, I thing.
OOOOh, the tensions....